Assuming you won't be tied up with Borderlands 2, Torchlight II, XCOM: Enemeny Unknown or Dishonored, there are plenty of temptingly-priced timewasters to be found this weekend, including up to 75% off Focus Home Interactive titles at Steam, Batman Arkham and F.E.A.R. bundles for only $9.99 on Amazon, assorted Ubisoft packs at GameStop, steeply discounted EA titles including Mass Effect 3 for $11.98 at GamersGate, 75% off various Grand Theft Auto titles through several dealers, and more.
Steam
{pf id:83881 size:small} Wargame: European Escalation $9.99 (75% off)
{pf id:81047 size:small} Game of Thrones Bundle $17.49 (75% off)
{pf id:81758 size:small} Cities XL 2012 $9.99 (75% off)
{pf id:1610 size:small} Cities XL 2011 $6.24 (75% off)
{pf id:1609 size:small} Cities XL Limited Edition $3.74 (75% off)
{pf id:3758 size:small} Sanctum: Collection $4.74 (75% off)
{pf id:1949 size:small} Divinity II: The Dragon Knight Saga $9.99 (75% off)
{pf id:4266 size:small} Pendulo Adventure Pack $14.99 (75% off)
{pf id:3844 size:small} The Sherlock Holmes Collection $8.74 (75% off)
{pf id:84695 size:small} Confrontation $9.99 (75% off)
{pf id:1985 size:small} Dracula Origin $2.49 (75% off)
{pf id:3986 size:small} Double Fine Bundle $14.99 (50% off)
{pf id:1198 size:small} Apox $3.74 (75% off -- today only)
Loki $2.49 (75% off)
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Amazon Digital
{pf id:81334 size:small} Batman Arkham Pack $9.99 (80% off)
{pf id:36909 size:small} F.E.A.R. Ultimate Pack $9.99 (78% off)
{pf id:86107 size:small} Darksiders II $24.99 (50% off)
{pf id:38056 size:small} Supreme Commander 2 $4.99 (67% off)
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GameStop
{pf id:86115 size:small} Sleeping Dogs $29.99 (40% off)
{pf id:3548 size:small} R.U.S.E. Bundle $12.49 (50% off)
{pf id:38243 size:small} Splinter Cell Bundle $11.49 (75% off)
{pf id:38242 size:small} Rainbow Six Bundle $7.49 (50% off)
{pf id:4298 size:small} The Settlers Bundle $19.99 (50% off)
{pf id:4195 size:small} TES V: Skyrim $35.99 (40% off -- also, Dawnguard for $13.99)
TES IV: Oblivion GotY Deluxe $12.49 (50% off)
TES III: Morrowind GotY $7.99 (60% off)
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GamersGate
{pf id:38944 size:small} Darkspore $4.99 (75% off)
{pf id:36505 size:small} Bulletstorm $4.99 (75% off)
{pf id:81987 size:small} Need for Speed: The Run $4.99 (75% off)
{pf id:83673 size:small} Mass Effect 3 $11.98 (60% off)
{pf id:3005 size:small} Mass Effect 2 $4.99 (75% off)
{pf id:3004 size:small} Mass Effect $4.99 (75% off)
{pf id:83611 size:small} Syndicate $10.48 (65% off)
{pf id:3900 size:small} Sins of a Solar Empire: Trinity $7.98 (60% off)
{pf id:36271 size:small} Alice: Madness Returns $4.99 (75% off)
{pf id:83502 size:small} Shank 2 $4.98 (50% off)
{pf id:4286 size:small} The Saboteur $4.99 (75% off)
{pf id:3086 size:small} Mirror's Edge $4.99 (75% off)
Pacific Pack $4.50 (90% off)
Gatling Gears $4.98 (50% off)
Warp $4.98 (50% off)
75% off Grand Theft Auto titles
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GameFly
{pf id:4155 size:small} Test Drive Unlimited 2 $9.99 (50% off)
{pf id:1437 size:small} Blur $4.99 (75% off)
{pf id:3216 size:small} Need for Speed: Hot Pursuit $4.99 (75% off)
{pf id:80311 size:small} Driver San Francisco $7.49 (75% off)
{pf id:3220 size:small} Need for Speed: Ultimate Digital Collection $11.99 (60% off)
{pf id:1930 size:small} Dirt 3 $19.99 (60% off)
Dirt Showdown $19.99 (60% off)
Pole Position 2012 $4.99 (75% off)
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Get Games
{pf id:3058 size:small} Metro 2033 $4.99 (75% off)
{pf id:80371 size:small} Warhammer 40K: Space Marine $7.49 (75% off)
{pf id:83614 size:small} Ghost Recon: Future Soldier $19.99 (50% off)
{pf id:54185 size:small} Deus Ex: Human Revolution $7.49 (75% off)
{pf id:1127 size:small} Aliens vs. Predator $4.94 (67% off)
{pf id:1139 size:small} Alpha Protocol $4.99 (75% off)
The Trouble With Robots $9.49 (50% off)
Company of Heroes Gold $7.49 (75% off)
Shoot Many Robots $4.99 (50% off)
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Green Man Gaming
20% off downloads via coupon code "GMG20-FXYD1-7WHP1"
75% off select GTA titles
GOG
60% off Ubisoft titles
Pay what you want for the Divinity Anthology
https://www.techspot.com/news/50481-weekend-game-deals-me3-12-batman-aaac-10-darksiders-ii-25.html