PlasticJungle just announced the closure of their site:
The team at Plastic Jungle would like to thank you for your participation in our gift card programs over the past seven years. Since 2006, Plastic Jungle has been a leader in providing you with great deals on gift cards in a secure marketplace.
As our business has grown and evolved, we have seen that the greatest potential for Plastic Jungle's long-term success is in working directly with our business partners. As a result, we will no longer be buying and selling gift cards at www.plasticjungle.com. This change is taking place effective May 13, 2013.
I have been using PlasticJungle a number of times and found them to be working well. However there are a number of alternatives you can find easily sorted by merchant at giftcardgranny.com:
I personally only have experiences with Cardpool – I had no complaints with them finalizing the transaction. The check always arrived on time.. However getting the affiliate commission from places like TopCashBack can be a pain (missing tracking).