With Dead Space 2 expected to launch next Tuesday, Steam has reduced the original title by 66% when purchased alone or 75% when preordering the sequel (which happened to make our list of most anticipated games for 2011). Meanwhile, Direct2Drive is celebrating Dead Space 2's arrival by knocking 20% off the most popular survival horror games, including Amnesia: The Dark Descent, Dead Space and Dead Space 2, Resident Evil 5, BioShock 2, F.E.A.R. 2 Project Origin, two S.T.A.L.K.E.R. titles and more.

Steam
Dead Space $6.80 (66% off -- 75% off with Dead Space 2 preorder)
APOX $9.99 (33% off)

Impulse
Master of Orion Collection $5.43 (66% off)
Total Annihilation $4.99 (50% off)
Atari 80 Classic Games in One $5.09 (66% off)
Avencast: Rise of the Mage $5.09 (66% off)
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GamersGate
King Arthur - The Role-playing Wargame $4.99 (75% off)
Test Drive Unlimited 2 $39.99 (20% off)
A.R.E.S.: Extinction Agenda $9.95 (33% off)
Alchemia - Extended Version $3.50 (50% off)
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Direct2Drive
20% off the "hottest survival games" via coupon code "survival"
APOX $9.95 (33% off)
Strong Bad's Cool Game for Attractive People $14.95 (50% off)

Good Old Games
30-50% off all Cyan games

Games for Windows
7 Wonders: Treasures of Seven $4.99 (50% off)

EAStore
Medal of Honor $29.49 (26% off)