Two of last year's finest indie titles are half off, with Steam offering Trine 2 for $7.49 and GameFly serving Bastion for the same price. With all the buzz around Assassin's Creed III, GameStop has marked the three most recent titles 50-75% off, along with a healthy discount on Warhammer 40k: Space Marine. Amazon has Mass Effect and its sequel priced at $5.99, while Origin offers the same promo with Batman: Arkham City for $10 when you buy Mass Effect 3 at full price.

Steam
85 Trine 2 $7.49 (50% off)
80 Trine $2.00 (80% off)
62 Gotham City Imposters $7.49 (50% off)
70 Age of Empires: All in Wonder Bundle $16.99 (66% off)
90 DCS A-10C Warhog $26.66 (33% off)
Digital Combat Simulator: Black Shark $13.33 (33% off)
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Amazon Digital
90 Mass Effect $5.99 (70% off)
93 Mass Effect 2 $5.99 (70% off)
93 Mass Effect 2 Digital Deluxe Edition $8.99 (70% off)
87 Sid Meier's Civilization V $21.65 (28% off)
88 Total War: Shogun 2 $25.21 (16% off)
78 Tropico 4 $19.99 (50% off)
87 Deus Ex: Human Revolution $19.99 (33% off)
82 Just Cause 2 $11.39 (24% off)
74 Dead Island $22.91 (24% off)
79 Metro 2033 $9.99 (50% off)
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GameStop
89 Assassin's Creed 2 $4.99 (75% off)
88 Assassin's Creed: Brotherhood $7.49 (75% off)
79 Assassin's Creed: Revelations $24.99 (50% off)
75 Warhammer 40k: Space Marine $14.99 (50% off)
D&D Anthology: The Master Collection $6.79 (66% off)
Neverwinter Nights Diamond $2.49 (75% off)
Neverwinter Nights Complete $7.49 (75% off)
Icewind Dale Complete $2.49 (75% off)
Icewind Dale II $2.49 (75% off)
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Green Man Gaming
84  Total War: Shogun 2 - Fall of the Samurai $19.79 (34% off)
80  King's Bounty: The Legend $2.48 (75% off)
Battlestations: Midway $4.99 (75% off)
Manhunt $2.49 (75% off)
Post Mortem $5.18 (60% off)
20% off preorders on Binary DomainDarksiders II: Limited Editionmore

GameFly
89  Bastion $7.49 (50% off)
79  Dungeons of Dremdor Complete $3.75 (50% off)

GamersGate
30-70% off Alawar titles
60-75% off Tropico titles
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Origin
87 Buy Mass Effect 3 for $59.99 and get Batman: Arkham City for $10