There's plenty of giftcard trading on Paxful, likely because there's no KYC requirement on the site yet AFAIK, and many traders don't require any receipts or any form of verification for you to trade your gift cards with them. There used to be some giftcard trading activity on LocalBitcoins as well, but they've since implemented mandatory KYC and I don't see a section for giftcard trading on the site anymore. Paxful's old UI is also very easy to use, though I'm just not a fan of the newer one.
i used pax before ,. but they charge high fees and suspend account for unknown reason and take all your funds. Also LBC removed most of the payment methods.so i just came across coinbaazar.com , which works on same timeline .