Still holding some holiday gift cards that you may never use? www.swapagift.com – will buy your unwanted cards for a percentage of the face value. (Note that the value has to be at least $25 in most cases, but if you are short on cash, this could be a solution for you).. there are many other websites that will let you buy, sell or trade your un-used, partially used or unwanted cards. My favorites include www.plasticjungle.com, www.giftcards.com, www.cardpool.com, and www.giftcardbin.com