I'm not sure if your location can do in-store trade ins, but I've used their online trade in program where I've mailed my items.

I've traded in some games as well as a cell phone and other items. I've gotten full value for the estimate that I was given which was good (answer them to the best of your ability, and it shouldn't be a problem as to how much the gift card would be).

The shipping label is free to print, but make sure that you pack the items well and send them off via UPS. Only drawback that I saw was that it took about a month total from when I mailed the items to when I got the gift card.