Half-Life 2 (75% Off)

Retailer: Gamefly

Price: $2.49 (75% Off)

Link: http://bit.ly/RsCKK8 

After receiving a Spike VGA commendation for "Game of the Decade" it's probably time you revisited this classic. It most definitely deserves to be in every PC gamer's collection and for a couple bucks it can be yours thanks to Gamefly. This is the title that propelled Valve to its current heights and that's worth something, even if not everyone remembers its creators' name.