Along with free weekend access and half off Call of Duty: Ghosts, Steam has cut 35-75% off Ubisoft titles, with the biggest discounts currently on Might and Magic games. Meanwhile, Crysis 3 is $5 at GameStop, Metro: Last Light is $20 at GamersGate, Company of Heroes 2 is $13 at Get Games, and Green Man Gaming has steep savings on assorted bundles including one with GTA III through GTA IV for $12.49. Also, the Humble Bundle is back with six indie releases including Antichamber, Dust: An Elysian Tail and Guacamelee for $5 or so.

Steam
73 Call of Duty: Ghosts $29.99 (50% off)
80 Arma 3 $35.99 (40% off)
83 Anno 2070 Complete Edition $12.49 (75% off)
80 Might and Magic VI: Complete Edition $9.99 (75% off)
85  Trials Evolution: Gold Edition $4.99 (75% off)
Orion: Dino Horde $0.99 (93% off)
Worms Clan Wars $7.49 (75% off)
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Amazon Digital
81 Kingdoms of Amalur + DLC Bundle $9.99 (75% off)
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GameStop
78  Crysis 3 $4.99 (75% off)
86  C&C The Ultimate Collection $4.99 (75% off)
57  Medal of Honor: Warfighter $4.99 (75% off)
74  Syndicate $4.99 (75% off)
92 Final Fantasy VII $5.99 (50% off)
51 Final Fantasy XIV: A Realm Reborn $14.99 (75% off)
Final Fantasy XI: Ultimate Collection $14.99 (50% off)
Final Fantasy VIII $5.99 (50% off)
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GamersGate
83  Metro: Last Light $20.00 (50% off)
79  Metro 2033 $3.74 (75% off)
85 Europa Universalis IV $10.00 (75% off) 
64 Galaxy on Fire 2 HD $5.00 (75% off)
78 Victoria Collection $9.99 (75% off)
Jagged Alliance Classics $3.25 (75% off)
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GameFly
75 Warhammer 40k: Space Marine $7.49 (75% off)
72 The Cave $3.75 (75% off)
64 Binary Domain $3.75 (75% off)
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Green Man Gaming
1C Strategy Collection $19.99 (50% off)
Rockstar Bundle $20.38 (83% off -- includes Max Payne 3 and LA Noire)
Just Cause Pack $5.49 (75% off)
Codemasters Action Pack $21.22 (75% off)
Telltale Games Collection $24.99 (75% off)
Lego Complete Pack $28.97 (75% off)
Complete GTA Bundle $12.49 (75% off)
20% off select titles when you spend $10+ via "OQE4LG-WEQPSE-SMCME1"
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Get Games
87 Civilization V $7.49 (75% off)
81 Lego: Marvel Super Heroes $10.19 (66% off)
81 Company of Heroes 2 $13.59 (66% off)
87 Deus Ex: Human Revolution Director's Cut $4.99 (75% off)
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Origin
Up to 50% off Battlefield titles (BF4 is $30)

GOG
60% off select strategy and action titles