It's a fine weekend for thrifty gamers to catch up on some of 2011's greatest hits, with 66 to 75% off Serious Sam 3: BFE, Red Faction: Armageddon, Deux Ex: Human Revolution, Saints Row: The Third, and The Witcher 2: Assassins of Kings. Human Revolution is as cheap as we've seen it since Christmas sales. Amazon has a particularly expansive range of discounts this week as part of its "Farewell to February" promotion, while Microsoft makes its periodic jump into the fray with half off Resident Evil 5, Street Fighter IV, Lost Planet 2 and Dead Rising 2.

Steam
75 Serious Sam Complete Pack $28.90 (66% off)
75 Serious Sam 3: BFE $13.60 (66% off)
87  Deus Ex: Human Revolution $10.19 (66% off -- DLC too)
61 The Baconing $3.74 (75% off -- today only)
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Amazon Digital
69  Payday: The Heist $4.99 (75% off)
80  Trine $1.24 (94% off)
84  Red Faction: Guerrilla $5.00 (75% off)
71  Red Faction: Armageddon $4.99 (75% off)
83  Saints Row: The Third $24.99 (75% off)
90  The Witcher 2: Assassins of Kings $14.99 (63% off)
77  The Darkness II $24.99 (50% off)
87  Deus Ex: Human Revolution $10.19 (66% off)
88  Assassin's Creed: Brotherhood Deluxe Edition $9.99 (75% off)
77  From Dust $4.94 (67% off)
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Games for Windows
84  Resident Evil 5 $9.99 (50% off)
90  Street Fighter IV $9.99 (50% off)
88  SSFIV Arcade Edition $19.99 (50% off)
 Lost Planet Colonies $14.99 (25% off)
61  Lost Planet 2 $14.99 (50% off)
79  Dead Rising 2 $14.99 (50% off)
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GameStop
81 The Witcher Enhanced Edition $9.99 (50% off)
71 Rainbow Six: Vegas 2 $9.99 (50% off)
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GamersGate
74 Majesty 2 Collection $5.99 (70% off)
67 Gothic Complete Pack & Arcania Gold $25.00 (50% off)
60  Next Life $9.98 (50% off)
Painkiller Black Edition $4.98 (50% off)
Painkiller Redemption $2.50 (50% off)
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Green Man Gaming
75 Warhammer 40,000: Space Marine $24.99 (50% off)
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Good Old Games
Buy one D&D classic, get one free (plus a gift)