I just added about 500 various non-casino related gift cards to my store on Delcampe. There's over 1,800 different gift cards currently listed, most at 50c each of we can work out a trade.

Here's a link to the gift card listings with the latest cards added appearing first
https://www.delcampe.net/en_GB/collectables/search?seller_ids%5B0%5D=554914&categories%5B0%5D=427