As part of Kalypso's anniversary celebration, Steam has slashed prices on many of the German developer's popular titles, including 66% off Dungeons and Tropico 3, which are also included in various anniversary packs. Meanwhile, Impulse offers 50% off the early Baldur's Gate titles, Direct2Drive cuts 33% to 60% off new titles such as Red Faction: Armageddon and Assassin's Creed: Brotherhood, and GamersGate has bargains on Mafia II, Trine, Dragon Age II and more.

Steam
Dungeons $13.59 (66% off)
Tropico 3: Gold Edition $6.79 (66% off)
The First Templar $13.59 (66% off)
Patrician IV  $10.19 (66% off)
Disciples III - Renaissance $10.19 (66% off)
Frozen Synapse $12.49 (50% off)
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Impulse
Baldur's Gate & Tales of the Sword Collection $4.99 (50% off)
Baldur's Gate: Shadows of Amn & Throne of Bhaal $4.99 (50% off)
Section 8: Prejudice $7.49 (50% off)
Gothic Bundle $19.99 (75% off)
Defender of the Crown: Heroes Live Forever $9.99 (50% off)
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GamersGate
Mafia II $7.49 (75% off)
Trine $1.99 (90% off)
Dragon Age II $29.95 (50% off)
Men of War: Collector Pack $29.99 (50% off)
Aliens vs Predators Classic 2000 $1.99 (60% off)
Civilization IV $8.00 (60% off)
S.T.A.L.K.E.R.: Shadow of Chernobyl $6.78 (66% off)
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Direct2Drive
Dead Space 2 $11.95 (60% off)
Assassin's Creed: Brotherhood $15.95 (60% off)
Red Faction: Armageddon $32.95 (33% off)
Alice: Madness Returns $24.95 (50% off)
Need for Speed Shift 2 $14.95 (50% off)
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Games for Windows
Blacklight: Tango Down $2.49 (75% off)

Good Old Games
Four Zork titles $14.36 (40% off)