Edit- Looks like this just hit front page of SD.
Newegg is having a gaming blowout and like most Newegg deals of this sort it's already going fast and some stuff selling out. The full list is below but some prices as of writing are not showing until you click the item itself.
As you can see on the page there's supposed to be a 10% off code VGMADNESS1 but again as of writing it is not working. If you really want something it's only 10% and I would not wait and miss out.
Highlight at the moment is Arkham Origins 360 for $25 with a $20 XBL card. This is limited to one free GC per person and it will cancel any more you order beyond that and charge you full price for the game.
Here's the full list of items that get you the GC.
Currently BBY has Arkham Origins 360 as $13 base TIV and $19.50 with the 50% trade bonus.
Remember that Ebates also does 1% back with Newegg.