Amazon is currently holding a buy one, get one free sale on select Ubisoft titles. All games included in the sale are DRM-free and only 5 dollars making the deal 2 for $5.00. Buy one now and you will get an e-mail with a code for another free of charge. The titles include: Assassin’s Creed, HAWX, Far Cry and Far Cry 2 along with various Tom Clancy games among others.
Keep in mind the Far Cry 1 download appears to be available only for a 32-bit OS.