They are basically like cash if you live in the first world.
I have a european paypal account capable of sending gift payments(no fees & no refunds) ; i am willing to pay first, a legit ebay account with almost a decade of transaction history etc.
I am a high value buyer that offers sellers certainty & peace of mind that they won't be scammed; i am willing to burden of the complete risk of the transaction; this has to be worth something to someone that is selling a legit GC. How much certainty is worth is the amazon GC market i don't know, i never purchased one; Anyways, if there are no sellers i will increase the amount of $$ i am offering ( feel free to private message me your asking prices for your 25$ giftcards )