Steam is practically giving away 2K's excellent shooters BioShock 1 and 2 today. If you don't have them already, don't be a fool.
For $5/£3.07, or less than the price of a two-piece Colonel's Meal at KFC, you can get yourself either of the moody, Big Daddy-filled FPS games from the 2K boys. There are few things on the world as good as that for just three quid. Except possibly a two piece Colonel's meal.
They've both been slashed from their (already cheap) usual price of $19.99 as part of Steam's '2K week'. We gave the Xbox version of BioShock 1 a 9.1 score, and BioShock 2 a 9.5, because they're bloody good, innit.