Celebrating Greenlight's one-year anniversary, Valve has approved 100 new games for Steam along with knocking 10% to 75% off some previously greenlit titles. Meanwhile, at rival distributors you'll find Dark Souls for $7.49, XCOM for $9.99, Tomb Raider for $12.49, BioShock Infinite for $19.99 and various bundles including one that'll get you the first two BioShock titles for $5 and another with a stack of Fable content for $7.49.

Steam
42  Aliens: Colonial Marines $4.99 (75% off -- today only)
74 Prison Architect $17.99 (40% off)
82 Natural Selection 2 $6.24 (75% off)
85 Euro Truck Simulator 2 $13.60 (66% off)
73 Surgeon Simulator 2013 $3.40 (66% off)
77 Cities in Motion 2 $4.99 (75% off)
Kinetic Void $6.80 (66% off)
Inquisitor $3.40 (66% off)
Gnomoria $2.72 (66% off)
La-Mulana $5.10 (66% off)
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Amazon Digital
64 Sega Action Pack $13.99 (87% off)
88 The Walking Dead $9.99 (67% off)
91 BioShock Infinite $19.99 (50% off)
76 Fable Bundle $7.49 (85% off)
68 Command & Conquer: The Ultimate Collection $8.99 (55% off)
85 Dark Souls: Prepare to Die Edition $7.49 (75% off)
86 BioShock 1 & 2 + Spec Ops: The Line $9.99 (89% off)
83 Borderlands + DNF + The Darkness II $9.99 (90% off)
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GameStop
84 Age of Empires III: Complete Collection $9.99 (75% off)
76 Fable III $4.99 (75% off)
88 Fallout 3: GotY $9.99 (50% off)
88 XCOM: Enemy Unknown $9.99 (75% off)
91 Dishonored $14.99 (50% off)
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GamersGate
81 Kingdoms of Amalur: Reckoning Collection $8.99 (70% off)
84 DMC Devil May Cry $24.98 (50% off)
88 Telltale Complete Pack $45.00 (70% off)
Dwarf Quest $2.00 (50% off)
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GameFly
88 Tomb Raider $12.49 (75% off)
81 Call of Duty: Black Ops II $29.99 (50% off)
80 King's Bounty Platinum Edition $24.99 (50% off)
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Green Man Gaming
25% off select titles via "GMG25-R7GA8-XTUCY"

Get Games
88  Tomb Raider $12.49 (75% off)
82 Lara Croft and the Guardian of Light $2.49 (75% off)
78 Tomb Raider: Underworld $2.24 (75% off)
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GOG
60% off "fading summer favorites"