Player Affinity writes: "Do you own both Bioshock games? If not, would you kindly head over to SteamPowered.com and check out their one-day-only sale on both Bioshock games. You can get Bioshock 1, or 2 for only $4.99. If you have three pals, and want to spread a few copies of Bioshock 2 around, you can get a fourpack of it for $14.99. This is good for today (Tuesday the 12th) only."