diff --git a/AGENTS.md b/AGENTS.md
index c067384..40ad329 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -853,7 +853,14 @@ session with **no other memory of this project**. So:
   the prices use them. All four round-trip through CSV, and the state is merged
   over `DEFAULT_CALC` on read (old sheets/presets can't produce NaN — `clampPct`
   is NaN-safe too). Currency switching also converts `targetMonthlyProfit`,
-  `batchSetupCost` and process `rate`. **Currency
+  `batchSetupCost` and process `rate`.
+  **Polish (2026-10-05, part 2):** the client-quote fields are a collapsed
+  `<details>` ("Client quote details") so the always-visible Margins card stays
+  short; `CalcSection` sets `aria-expanded`; every table row gains a **duplicate**
+  (Copy) action beside delete; the sticky summary chip shows the **order total**
+  when `quantity > 1` (and uses the setup-inclusive cost); and the marketplace
+  hand-off passes a **buyer-inclusive** unit price (tax added on top when tax
+  isn't marked inclusive). **Currency
   (2026-10-05):** a **searchable currency selector** (Popover + search) covering
   **sats + BTC** (both Bitcoin units) and every **fiat** Coinbase reports (crypto
   is filtered out via `FIAT_CODES`), and switching **converts every money field**
diff --git a/src/components/DeckCostCalculator.tsx b/src/components/DeckCostCalculator.tsx
index 1e1280d..7827df9 100644
--- a/src/components/DeckCostCalculator.tsx
+++ b/src/components/DeckCostCalculator.tsx
@@ -5,7 +5,7 @@ import { Input } from '@/components/ui/input';
 import { Textarea } from '@/components/ui/textarea';
 import { Button } from '@/components/ui/button';
 import { Popover, PopoverContent, PopoverTrigger } from '@/components/ui/popover';
-import { Plus, Trash2, RotateCcw, Search, ChevronDown, ChevronRight, Check, Save, FolderOpen, Download, Upload, AtSign, AlertTriangle, LayoutTemplate, SlidersHorizontal } from 'lucide-react';
+import { Plus, Trash2, RotateCcw, Search, ChevronDown, ChevronRight, Check, Save, FolderOpen, Download, Upload, AtSign, AlertTriangle, LayoutTemplate, SlidersHorizontal, Copy } from 'lucide-react';
 import { useLocalStorage } from '@/hooks/useLocalStorage';
 import { useBtcRates } from '@/hooks/useExchangeRate';
 import { useToast } from '@/hooks/useToast';
@@ -292,7 +292,7 @@ function CalcSection({ title, subtotal, defaultOpen = false, children }: { title
   const [open, setOpen] = useState(defaultOpen);
   return (
     <section className="rounded-2xl border border-white/10 bg-white/[0.02]">
-      <button type="button" onClick={() => setOpen((o) => !o)} className="flex w-full items-center gap-2 px-4 py-4 text-left">
+      <button type="button" aria-expanded={open} onClick={() => setOpen((o) => !o)} className="flex w-full items-center gap-2 px-4 py-4 text-left">
         <ChevronRight className={cn('h-4 w-4 shrink-0 text-gray-500 transition-transform', open && 'rotate-90')} />
         <h3 className="text-sm font-black uppercase tracking-wide text-[#ccff00]">{title}</h3>
         {subtotal && <span className="ml-auto text-xs font-bold text-gray-300">{subtotal}</span>}
@@ -638,6 +638,9 @@ export function DeckCostCalculator() {
   /** Markup (×) expressed as a gross margin, so the name matches the maths. */
   const marginPct = s.profitMargin > 0 ? Math.round((1 - 1 / s.profitMargin) * 100) : 0;
 
+  /** What a buyer actually pays for one deck (tax-inclusive when tax is added on top). */
+  const buyerUnit = s.taxInclusive || s.taxPct <= 0 ? r.priceWithPack : r.priceWithPack * (1 + s.taxPct / 100);
+
   /** Cheap sanity checks — surface the numbers that are probably mistakes. */
   const warnings = useMemo(() => {
     const w: string[] = [];
@@ -1225,7 +1228,7 @@ export function DeckCostCalculator() {
         </Popover>
         {rates && <span className="text-[10px] text-gray-500">live BTC rates · sats included</span>}
         <span className="ml-auto text-[11px] font-bold text-gray-400">
-          {fmt(r.costWithPack)} cost · <span className="text-[#ccff00]">{fmt(r.priceWithPack)} sell</span>
+          {fmt(r.costWithPackUnit)} cost · <span className="text-[#ccff00]">{fmt(r.priceWithPack)} sell</span>{r.qty > 1 ? <> · <span className="text-gray-300">{fmt(r.orderTotal)} total</span></> : null}
         </span>
       </div>
 
@@ -1300,7 +1303,12 @@ export function DeckCostCalculator() {
                   <td className={td}>{numInput(e.setupHrs, (n) => patch({ equipment: s.equipment.map((x) => x.id === e.id ? { ...x, setupHrs: n } : x) }))}</td>
                   <td className={td}>{numInput(e.boards, (n) => patch({ equipment: s.equipment.map((x) => x.id === e.id ? { ...x, boards: n } : x) }))}</td>
                   <td className={`${td} whitespace-nowrap font-bold text-gray-300`}>{fmt(e.boards > 0 ? (e.cost + e.setupHrs * r.laborPerHr) / e.boards : 0)}</td>
-                  <td className={td}><button onClick={() => patch({ equipment: s.equipment.filter((x) => x.id !== e.id) })} className="min-h-0 min-w-0 text-gray-600 hover:text-red-400" aria-label="Remove"><Trash2 className="h-3.5 w-3.5" /></button></td>
+                  <td className={td}>
+                    <div className="flex items-center gap-0.5">
+                      <button type="button" onClick={() => patch({ equipment: [...s.equipment, { ...e, id: uid() }] })} className="min-h-0 min-w-0 text-gray-600 hover:text-[#ccff00]" aria-label="Duplicate"><Copy className="h-3.5 w-3.5" /></button>
+                      <button type="button" onClick={() => patch({ equipment: s.equipment.filter((x) => x.id !== e.id) })} className="min-h-0 min-w-0 text-gray-600 hover:text-red-400" aria-label="Remove"><Trash2 className="h-3.5 w-3.5" /></button>
+                    </div>
+                  </td>
                 </tr>
               ))}
             </tbody>
@@ -1341,7 +1349,12 @@ export function DeckCostCalculator() {
                     <td className={td}>{numInput(m.orderMin, (n) => up({ orderMin: n }))}</td>
                     <td className={td}>{numInput(m.unloadMin, (n) => up({ unloadMin: n }))}</td>
                     <td className={`${td} whitespace-nowrap font-bold text-gray-300`}>{fmt(per)}</td>
-                    <td className={td}><button onClick={() => patch({ materials: s.materials.filter((x) => x.id !== m.id) })} className="min-h-0 min-w-0 text-gray-600 hover:text-red-400" aria-label="Remove"><Trash2 className="h-3.5 w-3.5" /></button></td>
+                    <td className={td}>
+                      <div className="flex items-center gap-0.5">
+                        <button type="button" onClick={() => patch({ materials: [...s.materials, { ...m, id: uid() }] })} className="min-h-0 min-w-0 text-gray-600 hover:text-[#ccff00]" aria-label="Duplicate"><Copy className="h-3.5 w-3.5" /></button>
+                        <button type="button" onClick={() => patch({ materials: s.materials.filter((x) => x.id !== m.id) })} className="min-h-0 min-w-0 text-gray-600 hover:text-red-400" aria-label="Remove"><Trash2 className="h-3.5 w-3.5" /></button>
+                      </div>
+                    </td>
                   </tr>
                 );
               })}
@@ -1372,7 +1385,12 @@ export function DeckCostCalculator() {
                     {advanced && <td className={td}>{numInput(p.rate, (n) => up({ rate: n }))}</td>}
                     {advanced && <td className={td}>{numInput(p.scrapPct, (n) => up({ scrapPct: Math.min(99, n) }))}</td>}
                     <td className={`${td} whitespace-nowrap font-bold text-gray-300`}>{fmt(per)}</td>
-                    <td className={td}><button onClick={() => patch({ processes: s.processes.filter((x) => x.id !== p.id) })} className="min-h-0 min-w-0 text-gray-600 hover:text-red-400" aria-label="Remove"><Trash2 className="h-3.5 w-3.5" /></button></td>
+                    <td className={td}>
+                      <div className="flex items-center gap-0.5">
+                        <button type="button" onClick={() => patch({ processes: [...s.processes, { ...p, id: uid() }] })} className="min-h-0 min-w-0 text-gray-600 hover:text-[#ccff00]" aria-label="Duplicate"><Copy className="h-3.5 w-3.5" /></button>
+                        <button type="button" onClick={() => patch({ processes: s.processes.filter((x) => x.id !== p.id) })} className="min-h-0 min-w-0 text-gray-600 hover:text-red-400" aria-label="Remove"><Trash2 className="h-3.5 w-3.5" /></button>
+                      </div>
+                    </td>
                   </tr>
                 );
               })}
@@ -1400,7 +1418,12 @@ export function DeckCostCalculator() {
                     <td className={td}>{numInput(p.minutesPerBoard, (n) => up({ minutesPerBoard: n }))}</td>
                     <td className={td}>{numInput(p.materialsPerBoard, (n) => up({ materialsPerBoard: n }))}</td>
                     <td className={`${td} whitespace-nowrap font-bold text-gray-300`}>{fmt(per)}</td>
-                    <td className={td}><button onClick={() => patch({ packaging: s.packaging.filter((x) => x.id !== p.id) })} className="min-h-0 min-w-0 text-gray-600 hover:text-red-400" aria-label="Remove"><Trash2 className="h-3.5 w-3.5" /></button></td>
+                    <td className={td}>
+                      <div className="flex items-center gap-0.5">
+                        <button type="button" onClick={() => patch({ packaging: [...s.packaging, { ...p, id: uid() }] })} className="min-h-0 min-w-0 text-gray-600 hover:text-[#ccff00]" aria-label="Duplicate"><Copy className="h-3.5 w-3.5" /></button>
+                        <button type="button" onClick={() => patch({ packaging: s.packaging.filter((x) => x.id !== p.id) })} className="min-h-0 min-w-0 text-gray-600 hover:text-red-400" aria-label="Remove"><Trash2 className="h-3.5 w-3.5" /></button>
+                      </div>
+                    </td>
                   </tr>
                 );
               })}
@@ -1497,10 +1520,14 @@ export function DeckCostCalculator() {
         )}
         <p className="mt-2 text-[11px] text-gray-500">Does not include shipping to the buyer.</p>
 
-        {/* Quote details — your identity on the client PDF. */}
-        <div className="mt-4 space-y-3 rounded-xl border border-white/10 bg-black/30 p-3">
-          <div className="flex items-center justify-between gap-2">
-            <p className="text-[11px] font-black uppercase tracking-wider text-gray-500">Quote details (for the client PDF)</p>
+        {/* Quote details — your identity on the client PDF (collapsed by default). */}
+        <details className="group mt-4 rounded-xl border border-white/10 bg-black/30 p-3">
+          <summary className="flex cursor-pointer list-none items-center justify-between gap-2 text-[11px] font-black uppercase tracking-wider text-gray-500 [&::-webkit-details-marker]:hidden">
+            <span>Client quote details (for the PDF)</span>
+            <ChevronDown className="h-3.5 w-3.5 transition-transform group-open:rotate-180" />
+          </summary>
+          <div className="mt-3 space-y-3">
+          <div className="flex items-center justify-end gap-2">
             <button
               type="button"
               onClick={fillFromProfile}
@@ -1616,13 +1643,14 @@ export function DeckCostCalculator() {
             <span className={label}>Notes / terms</span>
             <Textarea value={quote.notes} onChange={(e) => setQuote({ ...quote, notes: e.target.value })} rows={2} placeholder="Lead time, deposit, warranty…" className="bg-black/40 border-white/10" />
           </label>
-        </div>
+          </div>
+        </details>
 
         {/* Turn the number into an action: list it at this price, or find someone
             to build it. */}
         <div className="mt-4 flex flex-wrap gap-2">
           <Link
-            to={`/create-listing?price=${encodeURIComponent(String(Math.round(r.priceWithPack * 100) / 100))}&currency=${encodeURIComponent(cur)}`}
+            to={`/create-listing?price=${encodeURIComponent(String(Math.round(buyerUnit * 100) / 100))}&currency=${encodeURIComponent(cur)}`}
             className="inline-flex items-center gap-1.5 rounded-full bg-[#ccff00] px-4 py-2 text-xs font-black uppercase tracking-wide text-black transition-colors hover:bg-[#ccff00]/90"
           >
             List a deck at this price <ChevronRight className="h-3.5 w-3.5" />