Along with 75% off both Nazi Zombie Army releases, Steam offers State of Decay for $10 and a Commandos collection for $2. Elsewhere, Amazon has assorted combo deals including GTA IV and Max Payne 3 for $10, GameFly offers deals on various 2K titles (several of which are bundled for $30 at Green Man Gaming), and GamersGate has Telltale's first season of The Walking Dead as well as its DLC. You also have three days to grab the latest Humble Bundle, which now includes Fez, Starseed Pilgrim and Beat Buddy.

Steam
88 Mass Effect Collection $9.99 (75% off – no ME3)
76 Hearts of Iron III Collection $11.24 (75% off)
85  Red Faction Collection $14.99 (75% off)
67  Sniper Elite: Nazi Zombie Army $3.74 (75% off)
Naruto Shippuden: Ultimate Ninja Storm 3 Full Burst $23.99 (40% off)
Sniper Elite: Nazi Zombie Army 2 $3.74 (75% off)
Commandos Collection $1.94 (85% off)
State of Decay $9.99 (50% off)
Planetary Annihilation $29.99 (40% off)
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Amazon Digital
88 GTA IV: Complete + Max Payne 3 w/ Season Pass $9.99 (85% off)
88 GTA III through GTA IV $11.99 (82% off)
90  Dragon Age: Origins Ultimate Edtion $7.49 (75% off)
Manhunt + Manhunt 2 $4.99 (80% off)
Bully + Manhunt + Midnight Club 2 $6.99 (86% off)
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GameStop
45 Aliens: Colonial Marines $1.99 (80% off)
92 Company of Heroes $4.99 (50% off)
82 Company of Heroes 2 $13.59 (50% off)
81 Warhammer 40k: Dawn of War II Retribution $14.99 (50% off)
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GamersFly
89 XCOM: Enemy Unknown $7.49 (75% off)
92 BioShock Infinite $9.99 (67% off)
87 Borderlands 2 GotY $19.99 (50% off)
67 The Bureau: XCOM Declassified $7.49 (75% off)
81 Mafia II $7.49 (75% off)
77 The Darkness II $7.49 (75% off)
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GamersGate
87 Torchlight II $9.99 (50% off)
78 Chivalry: Medieval Warfare $8.50 (66% off)
80 Total War Rome II $29.98 (50% off)
72 The Cave $7.50 (50% off)
84 Euro Truck Simulator 2 $8.50 (66% off)
The Walking Dead Pack $7.49 (75% off)
88  Command and Conquer Ultimate Collection $4.99 (75% off)
68  Sniper Elite V2 Collection $13.75 (75% off)
Dominions 4: Thrones of Ascension $17.50 (50% off)
Poker Night 2 $1.25 (75% off)
Viking Battle for Asgard $3.75 (75% off)
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Green Man Gaming
87 2K Essential Collection (Borderlands 2, XCOM: Enemy Unknown + two more) $29.99 (72% off)
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Get Games
93 Final Fantasy VII $5.99 (50% off)
Rome: Total War Collection $1.45 (89% off)
Final Fantasy VIII $8.03 (33% off)
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GOG
70% off classic adventure titles