Selling to "someone else" always has risk of losing all your money. Not interested. Finding creative, circular ways to get either something usable or cash is what I've always aimed for. For example, back when Gamestop would sell eBay gift cards and take a Gamestop gift card, Paying $5 cash when the giftcard balance got to $5, I'd go in circles. Buy discounted Gamestop card on eBay (even if a $50 card is $49.99 with free shipping) paying with an eBay gift card, then using that Gamestop card to buy a $44.99 eBay card with that at Gamestop and pocketing the $5......
Can Best Buy cards still be used to buy gift cards? I have not done that for years. They used to and carried Shell gas cards which was awesome.