If the Meridian4 games pack doesn’t turn you on (and face it, it might not), Steam’s got the 2K Huge Games Pack.
That’s Sid Meier’s Civilization® IV, Sid Meier’s Civilization® III Complete, Sid Meier’s Pirates!, Shattered Union, Prey, CivCity: Rome, Civilization IV®: Warlords, Sid Meier’s Railroads!, Railroad Tycoon 3, Railroad Tycoon II Platinum, X-COM: Terror From the Deep, X-COM: Apocalypse, BioShock™, X-COM: Interceptor, X-COM: UFO Defense, X-COM: Enforcer, Civilization IV: Beyond the Sword, Freedom Force, Freedom Force vs. the Third Reich, and Sid Meier’s Civilization IV: Colonization.