Assuming Steam's summer sale didn't exhaust your gaming fund, there are plenty of deals to take advantage of this weekend, including 75% off Saints Row: The Third, Mass Effect 3, Crysis, Dragon Age, Scribblenauts Unlimited, Max Payne 3, LA Noire, Borderlands 2, XCOM and Tomb Raider -- several of which have been discounted by the largest amount we've seen to date. Meanwhile, the latest Humble Weekly Sale offers four Positech titles including Gratuitous Tank Battles and Gratuitous Space Battles for about $3.

Steam
82  Darksiders $3.99 (80% off)
78 Darksiders II $9.99 (80% off)
75 Flatout Complete Pack $9.99 (75% off)
79 S.T.A.L.K.E.R.: Shadow of Chernobyl $4.99 (75% off -- today only)
77  Revenge of the Titans Collection $3.74 (75% off)
Ultratron $2.49 (75% off)
Ultrabundle $7.49 (75% off)
Guns of Icarus Online $6.79 (66% off)
Droid Assault $2.49 (75% off)
70% off Command & Conquer titles
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Amazon Digital
83 Saints Row: The Third - The Full Package $12.49 (75% off)
68 Saints Row 2 $3.75 (75% off)
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GameStop
91 Dishonored $17.99 (40% off)
82 Just Cause 2 $2.99 (80% off)
79 Dragon Age II $4.99 (75% off)
93 TES V: Skyrim $20.99 (30% off)
87 Mass Effect 3 Digital Deluxe Edition $7.49 (75% off)
90 Dragon Age: Origins Ultimate Edition $7.49 (75% off)
79 Metro 2033 $7.49 (50% off)
71 The Saboteur $4.99 (75% off)
87 Burnout Paradise: The Ultimate Box $4.99 (75% off)
74 Dead Island GotY $9.99 (50% off)
88 Crysis $4.99 (75% off)
78 Crysis 3 $19.99 (50% off)
74 Syndicate $4.99 (75% off)
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GamersGate
81 Grid $7.48 (50% off)
78 Grid 2 $29.97 (40% off)
65 Fuel $4.98 (50% off)
81 Overlord Complete Pack $9.98 (50% off)
77 Operation Flashpoint Complete $13.74 (75% off)
78 Tropico 4 Collector's Bundle $15.00 (75% off)
85 Dirt 2 $7.48 (50% off)
86 Dirt 3 $8.48 (66% off)
82 F1 2012 $19.98 (50% off)
79 S.T.A.L.K.E.R. Collection $12.00 (70% off)
87 The Witcher 2 Enhanced Edition $11.97 (40% off)
75 Two Worlds II GotY $14.98 (50% off)
62 Scribblenauts Unlimited $4.99 (75% off)
84 Max Payne Complete Pack $19.96 (75% off)
Legacy of Kain Collection $6.12 (66% off)
Awesomenauts $2.50 (75% off)
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GameFly
82 LA Noire: The Complete Edition $7.49 (75% off)
84 Max Payne 3 $14.99 (50% off)
88  GTA IV: Complete Edition $9.99 (66% off)
GTA: San Andreas $4.99 (66% off)
GTA: Vice City $3.39 (66% off)
GTA III $3.39 (66% off)
Bully: Scholarship Edition $3.75 (66% off)
Manhunt $3.39 $(66% off)
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Green Man Gaming
75% off Square Enix titles including 88  Tomb Raider

Get Games
72 The Cave $5.09 (66% off)
88 XCOM: Enemy Unknown $9.19 (77% off)
88 Borderlands 2 $7.49 (75% off)
78 Grotesque Tactics Bundle $15.99 (47% off)
69 Hell Yeah!: Wrath of the Dead Rabbit $3.74 (75% off)
78 Call of Juarez: Bound in Blood $2.49 (75% off)
71 Rainbow Six: Vegas 2 $2.49 (75% off)
72 Shoot Many Robots $4.99 (50% off)
81 Splinter Cell: Conviction Deluxe Edition $6.79 (66% off)
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GOG
50% off Soviet strategy titles