How to Compare Prices Across Amazon, eBay and AliExpress (2026 Guide)

Three marketplaces dominate how most of us shop online: Amazon for speed and convenience, eBay for deals and used or refurbished stock, and AliExpress for rock-bottom prices direct from manufacturers. The problem is that the 'same' product can carry wildly different prices across all three — and the headline price is rarely the price you actually pay. This guide breaks down how each marketplace prices, where the hidden costs live, and a repeatable process for finding the genuinely cheapest option.

Why the same product costs three different prices

It helps to understand what you're really comparing. Amazon's price blends the product, fast (often free) delivery, and a returns process that almost never argues with you. eBay's price reflects a marketplace of independent sellers — new, open-box, and used — where competition pushes prices down but consistency varies. AliExpress sells closer to the factory, stripping out the middle layers, which is why a phone case can cost £2 instead of £9 — but you trade away delivery speed and buyer protection polish.

In other words, a £10 difference isn't always a saving. It can be the cost of two-day delivery, a no-questions return, or a three-week wait. The skill is knowing which of those you actually care about for the specific thing you're buying.

The hidden costs that flip the cheapest option

• Delivery: Amazon Prime bundles it; eBay varies by seller; AliExpress is often free but slow, and faster options can cost more than the item.
• Import VAT and handling: orders from outside the UK can attract VAT and a courier handling fee on delivery — this most often affects AliExpress and some overseas eBay sellers.
• Returns: factor in who pays return postage. A cheap item that costs £4 to send back is not cheap if it does not fit.
• Condition: an eBay "very good" refurb can be a genuine bargain or a tired unit — read the specific listing, not just the price.
• Coupons and cashback: marketplace coupons, voucher codes and cashback can quietly beat a lower sticker price elsewhere.

Compare the total landed cost — item + delivery + any import fees + the realistic cost of returning it — not the number in big text at the top of the page.

A simple 5-step process for comparing prices

1. Pin down the exact product

Model numbers matter. 'Wireless earbuds' is a category; 'Sony WF-1000XM5' is a product. Marketplaces are full of near-identical variants with different model codes, so lock onto the precise model (or an honest equivalent) before you compare, or you'll end up comparing apples to slightly-cheaper oranges.

2. Check all three marketplaces at once

This is exactly what a comparison platform is for. Rather than opening three tabs and three searches, a single comparison view pulls live listings side by side so you can see the spread instantly. Our own price-comparison pages do this across Amazon, eBay and partner retailers — for example you can compare air fryers, wireless earbuds, or robot vacuums and see who is cheapest right now.

3. Convert to total landed cost

Add delivery and any likely import fees to each option. For AliExpress in particular, assume VAT may apply and check whether faster shipping is worth it. A £6 AliExpress item with £4 shipping and a possible £2 VAT charge is £12 — the same as the Amazon listing that arrives tomorrow with free returns.

4. Weigh speed and protection against price

Be honest about urgency. For something you need this week, Amazon's delivery usually wins even at a small premium. For a planned, non-urgent purchase, eBay and AliExpress savings are real. For anything where fit, authenticity or warranty matters — electronics, branded goods, anything you might return — lean toward the marketplace with the cleanest returns.

5. Set a price alert instead of buying on impulse

Prices on all three platforms move constantly. If you're not in a hurry, a price-drop alert does the watching for you and emails you when the average across retailers falls. That single habit saves more money over a year than any amount of manual hunting.

Marketplace-by-marketplace: where each one wins

Amazon

Best for: urgency, big-brand electronics, and anything you might return. The premium you sometimes pay buys speed and a frictionless returns process. Watch for third-party sellers on Amazon Marketplace, where price and authenticity vary just like eBay.

eBay

Best for: refurbished tech, last-generation models, and items where new-vs-used flexibility unlocks real savings. Use seller ratings and the specific item condition notes as hard filters, not afterthoughts.

AliExpress

Best for: low-cost accessories, hobby and DIY parts, and unbranded goods where the factory price is the whole point. Budget for slower delivery and possible import VAT, and check store ratings and order counts before buying.

Let the comparison do the work

The honest takeaway: there's no single cheapest marketplace, only the cheapest option for a specific product at a specific moment, once you account for delivery, fees and returns. That's precisely the gap a comparison platform fills — surfacing live prices across retailers in one place so you can decide in seconds rather than tabs. Find your product, compare the total cost, set an alert if you can wait, and check out wherever the maths works out best.