Fetch the product page on all 23 supported Amazon stores. Each store shows its own top reviews (up to 13), so products sold in many countries return many more distinct reviews; products sold in few stores gain little. Duplicates are removed and every review keeps its marketplace. The primary store is checked first and the others are skipped if it shows no ratings; if 'Max reviews per product' is reached, the remaining stores are skipped too. Skipped stores are listed as NOT_CHECKED and not charged. Each additional store whose page shows the product is charged as a store page ($0.003), even when it adds no new reviews (a sign-in prompt, no written reviews, or only reviews already collected from another store); stores that don't sell it are free. Uses up to 23 page requests per product.