Digital outfits are offering the zillionth opportunity to grab Deus Ex: Human Revolution on the cheap, including a copy of the Augmented Edition for only $5.99 at GameSpot (it's a Steamworks title, so you should get a Steam key). As part of its end-of-summer sale, GameSpot also has 75% off titles including Dragon Age I & II, Mass Effect 2, Crysis 2, Mirror's Edge, Red Orchestra 2, Bulletstorm, Serious Sam 3 and more. Elsewhere, you'll find Civilization III and IV Complete for $2.48 and $6.24, C&C 4 for $5, L.A. Noire Complete for $7.49, and five hit THQ games for $12.49 (you'll get a Steam key to unlock all five).

Steam
87 Deus Ex Collection $14.99 (75% off)
87 Deus Ex: Human Revolution $7.49 (75% off)
81 Sam and Max Complete Pack $14.99 (70% off)
71 Alice: Madness Returns $4.99 (75% off -- today only)
70 Age of Empires Online: Steam Starter Pack $9.99 (50% off)
70 Age of Empires Online: Celebration Bundle $2.49 (50% off)
More...

Amazon Digital
68 H.A.W.X 2 $9.99 (50% off)
75 Two Worlds 2 GotY $9.99 (75% off)
79 Metro 2033 $9.99 (50% off)
78 Might & Magic: Heroes VI $20.03 (60% off)
83 Anno 2070 Deluxe Edition $23.91 (57% off)
69 Risen 2: Dark Waters $22.97 (54% off)
Final Fantasy XI: Ultimate Collection Abyssea Edition $9.99 (50% off)
TopWare Bundle $14.99 (85% off)
More...

GameStop
87 Deus Ex: Human Revolution Augmented Edition $5.99 (60% off)
90 Dragon Age Origins: Ultimate Edition $7.49 (75% off)
78  Dragon Age 2 $4.99 (75% off)
89 Assassin's Creed 2 $5.99 (70% off) 
93 Mass Effect 2 Digital Deluxe Edition $7.49 (75% off)
86 Crysis 2 Maximum $9.99 (75% off)
74 Red Orchestra 2: Heroes of Stalingrad $4.99 (75% off)
80 The Settlers 7: Paths to a Kingdom $8.99 (70% off)
79 Mirror's Edge $4.99 (75% off)
71 Mount & Blade Collection 75% off)
78 Tropico 4 $9.99 (50% off)
81 Splinter Cell Conviction $9.99 (50% off)
67 Need for Speed: The Run $9.99 (75% off)
81 Bulletstorm $4.99 (75% off)
75 Serious Sam 3: BFE $9.99 (75% off)
71 The Saboteur $4.99 (75% off)
88  Call of Duty: Modern Warfare 2 (50% off)
Call of Duty 4: Modern Warfare $9.99 (50% off)
Age of Empires III: Complete Collection $9.99 (75% off)
Rome: Total War Gold Edition (75% off) 
More...

GamersGate
75 Two Worlds Complete Collection $39.98 (50% off)
76 Hearts of Iron 3 Collection $7.49 (75% off)
77 SBK 09 $5.00 (50% off)
50 Stronghold Collection $9.98 (67% off)
86  NBA 2k11 $9.98 (50% off)
84  Civilization IV Complete $6.24 (75% off)
Civilization III Complete $2.48 (50% off)
X-COM Complete Pack $7.48 (50% off)
Sid Meier's Pirates! $4.98 (50% off)
MLB 2k11 $9.98 (50% off)
More...

GameFly
68 Command & Conquer 4: Tiberian Twilight $5.00 (75% off)
78 Victoria II $5.00 (75% off)
87 L.A. Noire: The Complete Edition $7.49 (75% off)
More...

Green Man Gaming
82 Darksiders $7.99 (60% off)
70 Homefront $4.99 (75% off)
84 Red Faction Guerilla $7.99 (60% off)
71 Red Faction Armageddon $7.99 (60% off)
83  Saints Row 2 $5.99 (60% off)
86  THQ 5-Pack $12.49 (50% off)
Red Faction $3.99 (60% off)
Nexuiz $3.99 (60% off)
More...

GOG
Up to 65% off Dungeons & Dragons titles