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Get Games is also running a QuakeCon sale. There’s the usual 25% discount on iD and Bethesda games. They’re also running a daily deal.
8/1
RAGE = $5 (75% off) (Steamworks)
8/2
Quake 4 (75% off)
8/3
Doom 3 BFG (75% off)
8/4
Wolfenstein 3D (75% off)