As the title says, you get a $10 bonus for and game trades when you buy a used game (I think it's per game, but it's hard to make out the fine print) and all strategy guides are half off.
Otherwise, there isn't much:
Cabela's Dangerous Hunts 2013 w/ Gun - $19.99
Wipeout: Create & Crash - $19.99
Angry Birds Star Wars - $19.99
Angry Birds Star Wars - $29.99