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Yes all top e-commerce does not sell any products, different seller make seller account on that e-commerce site to sell own products, so u visit that and read feedback from customer's what they told about.
For what it's worth I've had some great experiences on Etsy; my sister in law just bought me a really cute sweater from a seller, and I just ordered another one from her I liked it so much. I think the key is to communicate with the seller, and judge the reviewers/communication carefully. And be willing to be out the money/item if it's not what you expected.