Sorry for double post, but when you sell a giftcard, do you have to mail it? Or can you just give them the code on the back of the card
As SgtSpike mentioned, some cards can be spent online.
But with the prepaid card trading services listed in the link I gave most will want the card to be mailed in. One service offers the ability to bring the card to an agent who will redeem it:
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http://www.swapagift.com (agent locations in much of the U.S. / e.g., at check cashing stores)