While craigslist is always good place to dump unwatned gift cards for cash, this new site offers the would be seller a lot more alternatives. At cardavenue.com you can buy, sell and trade pre-owned gift cards for free (there are even no hidden fees, so says the front page). I haven’t tried it yet, but I just might next time I get stuck with an H&M gift card, or something equally useless (to me).