It's been ten years since Grand Theft Auto III hit shelves and most digital distributors are celebrating with a mega savings on GTA titles, including all the classics as well as GTA IV and its expansions. There are several other noteworthy bargains this weekend, including 50% off Alice: Madness Returns, 66% off Rift and Batman: Arkham Asylum (2009's entry), 41% off Deus Ex: Human Revolution and 25% off Resident Evil 5.

Steam
71 Alice: Madness Returns $14.99 (50% off)
64 Cargo! - The Quest for Gravity $6.79 (66% off)
88 GTA IV: Complete Edition $13.59 (66% off)
GTA Complete Pack $12.49 (75% off)
GTA: San Andreas $5.09 (66% off)
GTA: Vice City $3.39 (66% off)
GTA III $3.39 (66% off)
Sword of the Stars: Complete Collection $5.00 (75% off)
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Impulse
84 Rift $9.99 (66% off)
76 Men of War: Assault Squad $19.99 (50% off)
Up to 75% off GTA titles
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GamersGate
87 Deus Ex: Human Revolution $37.46 (41% off)
90 Batman: Arkham Asylum GotY $6.79 (66% off)
84 Lego Batman: The Videogame $6.78 (66% off)
Atomic City Adventures $9.99 (33% off) 
71-82% off Sonic titles
66-77% off GTA titles
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Direct2Drive
Sword of the Stars: Complete Collection $4.95 (75% off)
Up to 75% off GTA titles
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Games for Windows
84 Resident Evil 5 $14.99 (25% off)

Origin
The SimCity Box $9.99 (50% off)

Good Old Games
Up to 60% off Ubisoft Action Pack