Gogamer has Jade Empire Special Edition at $9.90 on the madness sale this week—(also Dungeon Seige II at $14.90)
they also have a Civ bundle pack, Civilization Chronicles for $24.90 that includes the older Civs:
Sid Meier's Civilization I
Sid Meier's Civilization II
Civilization II: Fantastic Worlds
Civilization II: Conflicts in Civilization
Civilization II: Test of Time
Sid Meier's Civilization III
Sid Meier's Civilization III: Play the World
Sid Meier's Civilization III: Conquests
Sid Meier's Civilization IV