If you haven't already grabbed the latest Humble Bundle, you have through this weekend to get nine cross-platform, DRM-free indie games with other goodies for less than five bucks. Elsewhere, you'll find Chivalry: Medieval Warfare and Natural Selection 2 for less than $10 each, a Borderlands bundle for $22, Dark Souls: Prepare to Die Edition for $10, Tomb Raider for $16.99 and tons more -- especially with GOG's summer sale.

Steam
82 Chivalry: Medieval Warfare $8.49 (66% off)
82 Natural Selection 2 $8.49 (66% off)
78 Endless Space - Emperor Edition + Disharmony $17.49 (50% off)
77 Space Pirates of Zombies $1.99 (80% off)
83  Worms Reloaded: GotY $8.49 (66% off)
60 StarDrive $14.99 (50% off -- today only)
Defender's Quest: Valley of the Forgotten $4.95 (67% off)
Joe Danger + Joe Danger 2: The Movie $14..99 (40% off)
Syberia Bundle $3.74 (75% off)
Jack Keane $2.49 (75% off)
Spirits $2.49 (75% off)
Galaxy on Fire 2 Full HD $9.99 (50% off)
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Amazon Digital
87 Borderlands Bundle $21.99 (78% off)
50-75% off Borderlands content
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GameStop
90  Batman: Arkham Asylum GotY $4.99 (75% off)
89  Batman: Arkham City $14.99 (50% off)
70 Lord of the Rings; War in the North $4.99 (75% off)
89 Bastion $3.74 (75% off)
78 Scribblenauts Unlimited $14.99 (50% off)
88 F.E.A.R. Bundle $14.99 (50% off)
50-75% off Lego titles
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GamersGate
85 Dark Souls: Prepare to Die Edition $10.19 (66% off)
76 Hearts of Iron 3 Collection $9.98 (50% off)
74 Sengoku $5.00 (50% off)
84 Crusader Kings II Collection $39.98 (50% off)
75 Magicka Collection $14.98 (50% off)
88 Empire: Total War Collection $7.49 (75% off)
52 A Game of Dwarves $4.98 (50% off)
74  Majesty 2 Collection $9.98 (50% off)
Victoria Collection $19.98 (50% off)
The Showdown Effect $5.00 (50% off)
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GameFly
79 Mount & Blade: Warband $9.99 (50% off)
77 War of the Roses: Kingmaker $14.99 (50% off)
77 Cities in Motion 2 $9.99 (50% off)
66 King Arthur II: The Roleplaying Wargame $4.99 (50% off)
Dungeonland $4.99 (50% off)
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Green Man Gaming
88  Guild Wars 2 $37.99 (36% off)
Dishonored: Dunwall City Trials $2.99 (40% off)
25% off select titles via coupon code "GMG25-BAWQB-8UQWG"
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Get Games
88  Tomb Raider $16.99 (66% off)
83 Anno 2070 $14.99 (50% off)
89  Anno 1404: Gold Edition $4.99 (75% off)
87 Civilization V $7.49 (75% off)
Civilization IV Complete Edition $7.49 (75% off)
Civilization III Complete Edition $2.49 (50% off)
Thief Gold $2.37 (66% off)
Thief II: The Metal Age $2.37 (66% off)
Thief: Deadly Shadows $3.05 (66% off)
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GOG
#NoDRM summer sale - 500+ titles discounted