There are tons of deals this weekend, but they're mostly repeats from recent months. Taking advantage of Black Ops II's hype, Amazon has reduced the original by 33% to $26.79. Meanwhile, in celebration of Morrowind's 10th anniversary, GameStop offers Morrowind and Oblivion for free when you purchase Skyrim at full price ($59.99). If you just want the older TES titles, both are available for 50% off on GameStop and Steam. Lastly, EA's Indie Bundle offers six titles for $20, including four with local co-op, which is somewhat of a rarity these days.

Steam
90 Batman: Arkham City $14.99 (50% off)
90 Batman: Arkham Asylum GotY $6.80 (66% off)
73  Sanctum Collection $5.00 (75% off + free weekend)
EA Indie Bundle $20.98 (70% off)
TES III: Morrowind $9.99 (50% off)
TES IV: Oblivion $12.49 (50% off)
Gatling Gears $4.99 (50% off)
Titan Attacks! $2.49 (50% off -- today only)
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Amazon Digital
87 Deus Ex: Human Revolution $6.99 (77% off)
68 Dungeon Siege 3 $4.99 (75% off)
88 Battlefield 3 $39.96 (33% off)
87 Civilization V $14.99 (50% off)
51 Final Fantasy XIV $9.99 (50% off)
87 Mass Effect 3 $39.99 (33% off)
79 Mount & Blade: Warband $9.99 (50% off) 
82 Call of Duty: Black Ops $26.79 (33% off)
75 Supreme Commander 2 $5.86 (61% off)
78 Tropico 4 $19.99 (50% off)
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GameStop
86 Lord of the Rings Online: Mithril Edition $14.99 (50% off)
70  Lord of the Rings: War in the North $9.99 (50% off)
90 Batman: Arkham City $14.99 (50% off)
90 Batman: Arkham Asylum $4.99 (75% off)
87 Civilization V $14.99 (50% off)
75 Magicka Collection $4.99 (75% off)
67 Aliens vs. Predator $4.99 (75% off)
78 Driver: San Francisco $10.19 (66% off)
77 From Dust $7.49 (50% off)
88 Assassin's Creed: Brotherhood Digital Deluxe Edition $13.59 (66% off)
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GamersGate
88 Total War: Shogun 2 $7.49 (75% off)
82 Napoleon: Total War Imperial $9.98 (50% off)
88 Empire: Total War $9.98 (50% off)
64 Alpha Protocol $9.98 (50% off)
83 Sonic Generations $14.98 (50% off)
76 Hearts of Iron Complete $26.99 (70% off)
Condemned - Criminal Origins $7.48 (50% off)
Rome: Total War Compete $7.48 (50% off)
Medieval 2 Total War Gold Edition $4.98 (50% off)
Virtua Tennis 4 $9.98 (50% off)
Renegade Ops $7.50 (62% off)
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GameFly
79 Assassin's Creed Revelations $24.99 (50% off)
{pf id: size:small} Up to 75% off Kalypso titles

Origin
75  Two Worlds II - Velvet GotY Edition $19.99 (50% off)

Green Man Gaming
50-75% off Paradox Interactive titles

GOG
50% off Rebellion titles