Anyone looking to buy or sell unwanted gift cards has a few options. Here's a look at three sites:

CardPool.com

Recent cash offer for a $100 Target card: $92; Recent sale price for a $100 Target card: $97. Site was launched in February. Sellers pay to mail unwanted cards to the site. There's no cost for buyers. Cards must be worth at least $25. Site recently listed about 200 cards for sale. You can return purchased cards for any reason for up to 100 days.

GiftCardRescue.com

Recent cash offer for a $100 Payless ShoeSource card: $75. Recent sale price for a $100 Payless ShoeSource card: $90. Site was launched in 2008. Sellers pay to mail unwanted cards to the site. There's no cost for buyers. Cards must be worth at least $15. Site recently listed about 130 cards for sale but it doesn't have as many gift cards from big national chains as the other two sites. Cards cannot be returned after purchase.

PlasticJungle.com

Recent cash offer for a $100 Walmart card: $90. Recent sale price for a $100 Walmart card: $96. Site was launched in 2007. Sellers can download a prepaid shipping label, but must pay for extras such as insurance or tracking. There's no cost for buyers. Cards must be worth at least $25. Site recently listed about 530 cards for sale. Has the widest selection of gift cards for buyers. Cards cannot be returned after purchase.