StackSocial has a few game offers going on. All of them activate on Steam. Sim City 4: Deluxe Edition $5 The Serious Sam Gamer Bundle $25 – includes: Serious Sam 3: BFE + Bonus Packs Serious Sam 2 Serious Sam Double D XXL Serious Sam HD: The First Encounter Serious Sam HD: The Second Encounter… Read More »
StackSocial has RollerCoaster Tycoon 3: Platinum on sale for $5 (83% off). Activates on Steam.
StackSocial has BioShock: Infinite on sale for $10. Activates on Steam.
StackSocial has Duke Nukem: Forever on sale for $5. The game requires Steam.
StackSocial has Civilization V: Gold Edition on sale for $12.50 (74% off) at their site. Requires Steam activation.
StackSocial has the iShooter Gamer Bundle on sale for $5 (81% off). Includes: Bleed Cubemen Sanctum Tower Wars All games include a SteamPlay license valid for Mac & PC according to the comments.
StackSocial has Call of Duty 4: Modern Warfare for $5 (75% off). Uses Steamworks.
StackSocial has Borderlands 2 on sale for $12 (60% off). Requires Steam activation.