I have yet to do a comparison of all the major gift card secondary marketplaces of my own, but I recently came across an article that referred to a comparison of seven sites done by Consumer Report ShopSmart magazine.  Unfortunately I am unable to find the original article as the ShopSmart magazine website has limited content, probably to motivate people to subscribe to the paper magazine.

Nonetheless, the results are about what I would have expected.

Whether you are buying or selling gift cards, there is no clear leader on value, but two sites most often had the best prices – Plastic Jungle and Card Pool.  You best bet is to shop around on multiple sites to find the best deal.

Update:  Here is the video of the ShopSmart review of these sites.

Boy, a used gift card meta-site like I suggested the other day would sure come in handy.