diff --git a/src/stores/coop.js b/src/stores/coop.js
index 5bea951..8d4da2e 100644
--- a/src/stores/coop.js
+++ b/src/stores/coop.js
@@ -1,6 +1,6 @@
 "use strict";
 
-const { normalizeCspc } = require("../utils/sku");
+const { normalizeSkuKey } = require("../utils/sku");
 const { humanBytes } = require("../utils/bytes");
 const { padLeft, padRight } = require("../utils/string");
 
@@ -163,10 +163,9 @@ function productFromApi(p) {
       (Number.isFinite(p?.Price) ? `$${Number(p.Price).toFixed(2)}` : "");
   
     const upc = String(p.UPC || "").trim();
-    const sku =
-      upc ||                      // use UPC if present
-      String(p.ProductStoreID);  // fallback to store-specific ID
-  
+    const rawKey = upc || String(p.ProductStoreID || "").trim() || String(p.ProductID || "").trim();
+    const sku = normalizeSkuKey(rawKey, { storeLabel: "Co-op World of Whisky", url });
+        
     const img = normalizeAbsUrl(p.ImageURL);
   
     return {
diff --git a/src/tracker/merge.js b/src/tracker/merge.js
index be06f08..9f44bdd 100644
--- a/src/tracker/merge.js
+++ b/src/tracker/merge.js
@@ -1,7 +1,7 @@
 // src/tracker/merge.js
 "use strict";
 
-const { normalizeCspc } = require("../utils/sku");
+const { normalizeSkuKey } = require("../utils/sku");
 const { normPrice } = require("../utils/price");
 
 function normImg(v) {
@@ -15,12 +15,10 @@ function isRealSku(v) {
   return Boolean(normalizeCspc(v));
 }
 
-function normalizeSkuPreserve(raw) {
-  const s = String(raw || "").trim();
-  const c = normalizeCspc(s);
-  return c || s; // CSPC if present, else keep UPC/ProductStoreID/etc
+function normalizeSkuForDb(raw, { storeLabel, url } = {}) {
+  return normalizeSkuKey(raw, { storeLabel, url });
 }
-  
+    
 
 function mergeDiscoveredIntoDb(prevDb, discovered) {
   const merged = new Map(prevDb.byUrl);
@@ -108,7 +106,7 @@ function mergeDiscoveredIntoDb(prevDb, discovered) {
     if (!prev) {
       const now = {
         ...nowRaw,
-        sku: normalizeSkuPreserve(nowRaw.sku),
+        sku: normalizeSkuForDb(nowRaw.sku, { storeLabel: nowRaw.storeLabel, url }),
         img: normImg(nowRaw.img),
         removed: false,
       };
@@ -121,7 +119,7 @@ function mergeDiscoveredIntoDb(prevDb, discovered) {
     if (prevUrlForThisItem === url && prev.removed) {
       const now = {
         ...nowRaw,
-        sku: normalizeSkuPreserve(nowRaw.sku) || normalizeSkuPreserve(prev.sku),
+        sku: normalizeSkuForDb(nowRaw.sku, { storeLabel: nowRaw.storeLabel, url }) || normalizeSkuForDb(prev.sku, { storeLabel: prev.storeLabel, url: prev.url }),
         img: normImg(nowRaw.img) || normImg(prev.img),
         removed: false,
       };
@@ -139,9 +137,9 @@ function mergeDiscoveredIntoDb(prevDb, discovered) {
     const prevPrice = normPrice(prev.price);
     const nowPrice = normPrice(nowRaw.price);
 
-    const prevSku = normalizeSkuPreserve(prev.sku);
-    const nowSku = normalizeSkuPreserve(nowRaw.sku) || prevSku;
-
+    const prevSku = normalizeSkuForDb(prev.sku, { storeLabel: prev.storeLabel, url: prev.url });
+    const nowSku = normalizeSkuForDb(nowRaw.sku, { storeLabel: nowRaw.storeLabel, url }) || prevSku;
+    
     const prevImg = normImg(prev.img);
     let nowImg = normImg(nowRaw.img);
     if (!nowImg) nowImg = prevImg;
diff --git a/src/utils/sku_map.js b/src/utils/sku_map.js
index 3a45d4f..9385725 100644
--- a/src/utils/sku_map.js
+++ b/src/utils/sku_map.js
@@ -56,8 +56,9 @@ function isNumericSku(k) {
 }
 
 function isUpcSku(k) {
-  // UPC-A/EAN/GTIN-ish (most common: 12 or 13; sometimes 14)
-  return /^\d{12,14}$/.test(String(k || "").trim());
+    const s = String(k || "").trim();
+    if (s.startsWith("upc:")) return true;
+    return /^\d{12,14}$/.test(s); // keep legacy support
 }
   
 
diff --git a/viz/app/linker_page.js b/viz/app/linker_page.js
index 94f9a58..f76ba12 100644
--- a/viz/app/linker_page.js
+++ b/viz/app/linker_page.js
@@ -233,8 +233,9 @@ function isSoftSkuKey(k) {
 
 
 function isUpcSkuKey(k) {
-  return /^\d{12,14}$/.test(String(k || "").trim());
-}
+    const s = String(k || "").trim();
+    return s.startsWith("upc:") || /^\d{12,14}$/.test(s);
+  }
   
 
 function isABStoreLabel(label) {