I know it's strange to make a thread for this (I always thought of making a deal thread, but there's no point when you can just point your browser to cheapassgamer.com) but it's a really good special, so I thought I should share it.
From now until June 12th any game(s) you trade in at GameStop will net you an additional 50% (or 60% if you're a PowerUp Rewards member) on top of the game(s) base trade-in price. So if you got any games you wanna get rid of, now's the time to do it.
I'm trading in L.A. Noire as I platinumed it, DBZ: BT3 and Metal Gear Solid: PO cause I didn't like them, and GoW: Ghost of Sparta and MGS: Peace Walker cause of the HD collections. Doing so will net me $93, that's pretty much the Uncharted 3: Collectors Edition.
Gekko, you're gonna be busy man.
This CAG thread has a list of updated TiV's on all accepted platforms a few posts down: http://www.cheapassgamer.com/forums/showthread.php?t=292073