I just wanted buy amazon gift cards there, but since i didn't find many information about it.
So, i bought it in https://www.egifter.com. Price is quite normal & have point system which can be redeemed to gift card.

It would be great to see someone who have experience with bitcart.io since they offer cheap amazon gift cards.
I wanted to try there, but smallest amount is $50 & it's too risky since i don't have many bitcoin