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The Get Games 12 Days of Christmas deal for the day is a sale on Civ games.
Civilization V Gold Edition $15 (Steam)
Civilization V – Brave New World $7.49 (Steam)
Civilzation V Gold + Civilzation V – Brave New World $20 (Steam)
The daily deal for 12/19/13 is:
Duke Nukem 3D: Megaton Edition $2.49 (Steam)