Steam is holding another publisher sale, discounting Square Enix/Eidos titles by 50% through March 26 with a new game or franchise reduced by 75% every day (Tomb Raider today). It's worth noting that Deus Ex: Human Revolution will likely be chosen at some point, making the game about $7.50. Meanwhile, GamersGate bundles Dragon Age: Origins Ultimate Edition and Dragon Age II for $13.58, Amazon has Total War: Shogun 2 for $7.49 (Fall of the Samurai is 33% off at Green Man Gaming), and EA is still offering Batman: Arkham City for $10 if you buy Mass Effect 3 for the full price.

Steam
87 Deus Ex: Human Revolution $14.99 (50% off)
82  Just Cause 2 $7.49 (50% off)
76 The Last Remnant $24.99 (50% off)
75  Supreme Commander 2 $7.49 (50% off)
68  Dungeon Siege III $14.99 (50% off)
82  Lara Croft and the Guardian of Light $3.74 (75% off)
78  Tomb Raider: Underworld $4.99 (75% off)
Tomb Raider: Legend $3.74 (75% off)
Tomb Raider: Anniversary $2.49 (75% off)
Thief: Deadly Shadows $7.49 (50% off)
Eve Online: Crucible $6.80 (66% off)
The Hitman Collection $6.24 (75% off)
Square Enix Hit Collection $74.99 (76% off)
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Amazon Digital
88 Total War: Shogun 2 $7.49 (75% off)
91 NBA 2K12 $9.99 (50% off)
90 Dragon Age: Origins $15.30 (23% off)
74 Dead Island $22.92 (24% off)
87  Sid Meier's Civilization V $22.44 (25% off)
Neverwinter Nights 2 (Mac) $0.99 (95% off)
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GameStop
70 Lord of the Rings: War in the North $19.99 (33% off)
77 Lead and Gold $2.49 (75% off) 
Europa Universalis III: Chronicles $7.49 (75% off)
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GamersGate
90 Dragon Age Complete Pack $13.58 (66% off)
82 Darksiders $5.00 (75% off)
68 Saints Row 2 $7.48 (50% off)
86 Warhammer 40k: Dawn of War II Gold Edition $14.98 (50% off)
71 Red Faction Complete Pack $12.48 (50% off)
S.T.A.L.K.E.R. Shadow of Chernobyl $9.98 (50% off)
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Green Man Gaming
84  Total War: Shogun 2 - Fall of the Samurai $19.79 (34% off)
Thief: Deadly Shadows $4.99 (75% off)
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GameFly
74 Dead Island: Bloodbath DLC $7.49 (25% off)
76 Zuma's Revenge $9.99 (50% off)

Origin
87 Buy Mass Effect 3 for $59.99, get Batman: Arkham City for $10

Good Old Games
50% off Atari titles (including Masters of Orion 1-3 and Total Annihilation)