A deal so good we had to start it early. Get any of the Quake games for 50% off or even more if you get the Quake Collection.

The individual titles are:
Quake
Quake Mission Pack 1: Scourge of Armagon
Quake Mission Pack 2: Dissolution of Eternity
Quake 2
Quake 2 Mission Pack 1: The Reckoning
Quake 2 Mission Pack 2: Ground Zero
Quake 3 Pack
Quake 2007 Collection

More...