Marketplace
I searched for some items in Aliexpress without any cashback sites and found a few types with multiple sellers selling them for the same total price.
But when I went through Shopback and did the same exact search, I couldn't find them anymore at that same total price. They were all higher in total.
To prove I wasn't going crazy, I added the one with the price I wanted to my cart, logged out and went through shopback but couldn't find the item with the same price anymore through their search engine. I then clicked on my cart and bought the item with the price i wanted.
Therefore BEWARE when using shopback with Aliexpress, the prices seem to be >5% more expensive compared by just going directly to Aliexpress. Not sure about cashrewards, didnt test it.
Note: Shopback has rules which states "Empty cart before clicking through ShopBack" & "Add items to your cart after clicking through ShopBack". I think these rules are there to prevent a workaround for this issue.
Going through any AliExpress affiliate link (cashback websites) causes a cookie to remove or the change the prices of a lot of cheaper products.
How can you tell? The homepage will be directed to best.aliexpress.com (sometimes) and when you search for products the URL shows aliexpress.com/af instead of aliexpress.com/search (everytime).
The solution? Browse in incognito, make a note or add products to your wishlist before clicking through SB so they won't disappear.