This ought to see you through the weekend. 2k have announced the release of the "2K Huge Game Pack" on Steam, which bundles BioShock, five Civ titles, five X-Com titles and nine other games, all for $54.
Here's every game you get in the pack:
Sid Meier's Civilization IV
Sid Meier's Civilization III Complete
Sid Meier's Pirates!
Civilization IV: Warlords
Sid Meier's Railroads!
Railroad Tycoon 3
Railroad Tycoon II Platinum
X-COM: Terror From the Deep
X-COM: UFO Defense
Civilization IV: Beyond the Sword
Freedom Force vs. the Third Reich
Sid Meier's Civilization IV: Colonization
Wow. The pack will normally retail for $60, but this weekend will only be $54. Not bad when you consider the games are $230 purchased individually.