Borderlands 2 (50% Off)

Retailer: Steam

Price: $29.99 (50% Off)

Link: http://bit.ly/N5EoZo 

The console versions may be recieving a bundle disc full of Borderlands 2 add-on content later this month, but the PC version is seeing a boatload of sales on the game itself. If you're dead-set on playing the original before grabbing the sequel, it's also discounted on Steam this weekend for only $7.49 (75% Off) at http://bit.ly/PpmtOL