Along with discounting some EA racing titles beside the launch of Need for Speed Rivials, Steam has 75% off Rage and Red Orchestra 2. Meanwhile, Amazon has various bundles including all three BioShocks for $15, four GTA releases for $12, an XCOM collection for $10 and both Borderlands titles for $12, not to mention Max Payne 3 complete for $7 and Mass Effect 3 Deluxe for $10. GameFly has cut prices on puzzle games includiung Portal 2 for $5, Get Games is running sales on the Total War series as well as adventure titles and GOG has discounted classic shooters.

Steam
76  Rage $4.99 (75% off + free weekend)
74 Red Orchestra 2 GotY $2.49 (75% off)
76 Arma II: Complete Collection $7.99 (80% off)
79 Shift 2 Unleashed $4.99 (75% off)
63 Need for Speed Undercover $2.49 (75% off)
80 Need for Speed: Shift $4.99 (75% off)
86 Need for Speed: Hot Pursuit $4.99 (75% off)
87  Burnout Paradise: The Ultimate Box $4.99 (75% off)
84 Eve Online $4.99 (75% off)
85 Europa Universalis IV $19.99 (50% off)
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Amazon Digital
92 BioShock Triple Pack $14.99 (85% off)
88 GTA Trilogy + GTA IV $10.99 (80% off)
88 The XCOM Collection $9.99 (83% off)
88 The Walking Dead Pack $7.49 
88 Far Cry 3 $14.99 (50% off)
88 Borderlands GotY + Borderlands 2 $11.99 (83% off)
84 Max Payne 3 + GTA IV $7.99 (87% off)
84 Max Payne 3 Complete $6.99 (92% off)
87 Mass Effect 3 Deluxe Edition $9.99 (67% off)
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GamersGate
78  Driver San Francisco Deluxe Edition $6.25 (75% off)
80 TrackMania 2 Valley $10.00 (50% off)
82 TrackMania 2 Canyon $10.00 (60% off)
TrackMania 2 Stadium $5.00 (58% off)
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GameFly
89  Portal $2.49 (75% off)
95 Portal 2 $4.99 (75% off)
71 Quantum Conundrum $2.25 (75% off)
78 Scribblenauts Unlimited $7.49 (75% off)
InFlux $2.49 (75% off)
Puddle $3.59 (60% off)
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Green Man Gaming
25% off select titles via "GMG25-DW6L1-6XGZ9"
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Get Games
83 Deponia Trilogy $29.98 (50% off)
88 Total War Master Collection $22.49 (75% off)
88 Total War Grand Master Collection $41.24 (75% off)
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GOG
60% off select shooters