Batman: Arkham Origins free with purchase of select Nvidia video cards
Nvidia has announced those who purchase GTX 600 or GTX 700 series graphics card by January 31, 2014 will receive a copy of Batman: Arkham Origins. The game makes use of Nvidia’s PhysX and TXAA anti-aliasing. Batman: Arkham Origins releases on October 25.
Aslo
Amazon is having a sale, US only but there are ways around that lol
Some good deals on there
Dark Souls is $7.50
Sid Meier's Civilization V: Brave New World is $14.99
Age of Empires II HD is $9.99
etc
if you are only interested in Steam codes you can find just the games with steamworks here
@TheVoxelman on twitter