Shopping Hack: Search Amazon, eBay, and Google Shopping at Once

A monitor I bought last year was $329 on Amazon, $289 on eBay from an authorised reseller, and $264 in Google Shopping from a retailer I had never heard of. Same model, same warranty, three prices, forty minutes of my life if I had checked them one at a time.

Searching five marketplaces in parallel turns that forty minutes into about eight. The routine below is what I actually do, including the part where I decide not to buy the cheapest listing.

What “the same product” means

Marketplace search is a matching problem before it is a price problem. Get the identifier right and everything else follows:

• Model number, not marketing name. “Dell U2723QE”, not “Dell 27-inch 4K USB-C monitor”.
• Include the variant. Size, colour, capacity. A 1TB drive and a 2TB drive are not a price comparison.
• For used goods, add the condition. “Excellent”, “Open box”, “For parts” change the baseline entirely.

The eight-minute routine

1. Open the shopping channel. MuchSearch Shopping holds Amazon, eBay, Etsy, Walmart, Target, Best Buy, AliExpress and Google Shopping with a search box each.
2. Paste the model number once. Every card syncs, so you are not retyping it five times — the single biggest time sink in manual comparison.
3. Search on three first: Amazon (baseline), eBay (used/refurb), Google Shopping (small retailers). Those three cover new, used and long-tail in one pass.
4. Add Walmart or Best Buy only if you want local pickup today, and AliExpress only if you can wait three weeks for a lower price.
5. Record four numbers per tab: item price, shipping, tax estimate, return window. The cheapest sticker price regularly loses on the last two.
6. Check the seller, not just the price. Amazon: “sold by” Amazon vs third party. eBay: 12-month feedback and “returns accepted”. Google Shopping: is the retailer’s domain real, and do they have a phone number?
7. Verify the discount. A price-history tool tells you whether “$329 was $499” was ever true.

What each marketplace is actually good at

Four traps that eat the saving

The fake “was” price. A listing that has shown “40% off” for eleven months has no discount; it has a marketing department. Check price history before feeling clever.

Shipping and returns math. A $264 listing with $18 shipping and a 14-day return window is worse than a $289 listing with free shipping and 30 days — unless you are certain the item is right.

Warranty geography. Grey-import electronics are cheap because the warranty is in another country. For anything over a few hundred dollars, check who services it locally.

Model-year swaps. Retailers discount last year’s model with a nearly identical name. Confirm the exact model string before celebrating 30% off.

Refurbished and open-box: where the real savings are

The biggest spread in any electronics search is not between retailers — it is between conditions. A two-year-old flagship at 55% of its launch price usually beats a new mid-range model, and the failure rate on manufacturer-refurbished units is low because they were individually tested.

Three rules keep refurbishment safe:

• Buy manufacturer-refurbished, not “seller-refurbished”. The first carries a real warranty; the second often means “wiped and photographed”.
• Check the battery health number for laptops and phones. “Excellent condition” with 78% battery capacity is a different product.
• Confirm the return window in writing. Refurbished units are where return terms actually matter, because the photos can be flattering.

On eBay this means filtering by “Returns accepted” before sorting by price — otherwise the cheapest listing is often the one you cannot send back.

Buying used without regret

eBay is the strongest tool here, and the difference between a good and bad purchase is almost entirely in the listing text. Search the model plus “for parts” to learn the failure modes people complain about, then search again for the working item and read the descriptions for those specific words. A seller who mentions “no fungus, no haze” on a lens knows what buyers check — that is a good sign, not a guarantee.

Ask one question before buying: “Can you confirm the serial number and that the item in the photos is the item shipped?” A seller who answers precisely is worth a small premium over one who answers with a stock reply.

How I decide

My rule is boring and it works: Amazon for anything I might return, eBay for anything discontinued or repairable, Google Shopping to confirm the market price, AliExpress only for parts I can afford to lose. The cheapest tab is often the wrong tab, and knowing that in advance is the actual hack.

For the broader pattern of running one query across many sites, see searching Google, ChatGPT and Perplexity at once. For finding product photos rather than products, the stock photo guide covers that.