amazon elsewhere for some reason still allows third party sales.
https://esellercafe.com/amazon-restricts-gift-card-purchases-from-gift-card-malls/
damn it. i was about to post that i couldn't find anything to corroborate this, and how it's weird that no one's talking about it.
but then i went on eGifter. they shut down amazon too!
however, it seems like eGifter left a loophole (in the US only). they say you can still buy amazon gift cards using "an 'eGifter swap' performed by a gift recipient." here's how that works:
The only current limitation for using an eGifter Swap Card is if you select Amazon.com. In this case, the Amazon.com card cannot exceed the value of the eGifter Swap card. Additionally, if you combine other brand gift cards with Amazon.com in your eGifter shopping cart, you will only be able to use the following payment methods at checkout:
i haven't tried it, but it looks like you can still buy most gift cards with bitcoin, then "gift it to yourself" (different account) and then swap it. my friend swears by eGifter and has put thousands through it, so i might try this out next time i need one.