How to track one product across several stores

Stores do not coordinate. A camera can be full price at one retailer and twenty per cent off at another in the same week, and the gap usually closes days later once someone notices. Watching one page means seeing one price; watching three means seeing the market.

Set it up once

1. 01Save the same product three timesAdd the product page from each store you would genuinely buy from, including delivery you find acceptable.
2. 02Give each one its own targetPrices differ by region and currency, so a single number does not fit every page.
3. 03Let the first one winYou get the alert from whichever store crosses its target first, and you buy there.

Watch for the traps

• Currency — a page in another currency can look cheaper until the exchange rate, duties and import handling are added.
• Delivery — the item price is what is tracked, so factor shipping into the target you set for each store.
• Variants — make sure all three pages are genuinely the same model, not a similar one with a different kit or capacity.
• Seller identity — a marketplace listing inside a large retailer is not the same offer as the retailer's own stock.

Comparing stores is not about finding the cheapest today. It is about knowing which store moves first on the thing you want.

Who tends to move first

Specialists usually lead on their own category: component retailers on graphics cards, photography specialists on lenses, appliance specialists on washing machines. The generalists follow within a week, sometimes undercutting to keep the sale.

That order is why tracking a specialist and a generalist together is more informative than tracking two generalists — you see the change and then the response.

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