Amazon has some of the best deals we've seen in a while, with steep discounts on various titles launched earlier this year. Some notables include Mass Effect 3 for $15.99, all the Crysis titles for $14.98, Borderlands + DNF + The Darkness II for $19.99 (or just The Darkness II for $9.99, cheaper than Steam's weekend sale), GTA IV + Max Payne 3 for $29.99, BioShock 1 & 2 + Spec Ops The Line for $19.99, Syndicate for $9.99 and many more. There's not a ton to see elsewhere, though GamersGate has 75% off Supreme Commander and GameFly offers 75% off Napoleon: Total War and various Square Enix titles.
Steam
{pf id:83503 size:small} The Darkness II $12.49 (75% off)
{pf id:54174 size:small} Age of Empires Online DLC: Celebration Bundle $2.49 (50% off)
{pf id:84117 size:small} Vessel $9.99 (33% off)
Lunar Flight $4.99 (50% off)
Containment: The Zombie Puzzler $2.99 (40% off)
Vertex Dispenser $3.39 (66% off -- today only)
War of the Immortals Starter Pack $4.99 (67% off)
War of the Immortals Wander's Pack $14.99 (50% off)
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Amazon Digital
{pf id:83673 size:small} Mass Effect 3 $15.99 (60% off)
{pf id:83673 size:small} Mass Effect 3 Digital Deluxe Version $19.99 (60% off)
{pf id:1764 size:small} Crysis Maximum Pack $14.98 (79% off)
{pf id:1452 size:small} Borderlands + DNF + The Darkness II $19.99 (80% off)
{pf id:83955 size:small} Grand Theft Auto IV + Max Payne 3 $29.99 (67% off)
{pf id:1392 size:small} BioShock 1 & 2 + Spec Ops The Line $19.99 (78% off)
{pf id:2771 size:small} Kingdoms of Amalur: Reckoning $15.99 (60% off)
{pf id:83503 size:small} The Darkness II $9.99 (80% off)
{pf id:3970 size:small} Split Second $4.00 (80% off)
{pf id:4328 size:small} The Sims 3 $11.99 (60% off)
{pf id:3058 size:small} Metro 2033 $10.00 (50% off)
{pf id:83611 size:small} Syndicate $9.99 (67% off)
{pf id:1949 size:small} Divinity II: The Dragon Knight Saga $5.99 (85% off)
{pf id:3220 size:small} Need for Speed Ultimate Digital Collection $11.99 (60% off)
{pf id:3729 size:small} Saints Row 2 $7.50 (50% off)
{pf id:36702 size:small} Dead Space Dual Pack $7.99 (80% off)
{pf id:3548 size:small} R.U.S.E. Bundle $7.39 (80% off)
{pf id:84934 size:small} Prototype 2 $24.99 (50% off)
{pf id:3589 size:small} Red Faction: Armageddon $10.00 (50% off)
X-COM: Collection $3.75 (75% off)
Disney Kids and Family Pack $8.99 (94% off)
Final Fantasy XI: Ultimate Collection $9.99 (50% off)
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GameStop
{pf id:2980 size:small} Majesty 2 Collection $6.79 (66% off)
{pf id:2035 size:small} Dungeon Siege III Bundle $12.49 (50% off)
{pf id:38340 size:small} Warhammer 40k Dawn of War Collection $16.99 (66% off)
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GamersGate
{pf id:4100 size:small} Supreme Commander Gold Edition $5.00 (75% off)
{pf id:2449 size:small} Gray Matter $7.50 (75% off)
{pf id:3701 size:small} Runaway 3: A Twist of Fate $5.99 (70% off)
{pf id:83878 size:small} Yesterday $14.98 (50% off)
{pf id:1781 size:small} Cursed Mountain $4.98 (50% off)
{pf id:1800 size:small} Dark Fall: Lost Souls $4.98 (50% off)
Ultimate Crime Thriller Collection $7.49 (75% off)
Ultimate Mystery Collection $4.99 (75% off)
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GameFly
{pf id:3046 size:small} Men of War $3.75 (75% off)
{pf id:3047 size:small} Men of War: Assault Squad GotY $9.99 (75% off)
{pf id:3048 size:small} Men of War: Red Tide $6.25 (75% off)
{pf id:38247 size:small} Torchlight $5.00 (66% off)
{pf id:2747 size:small} Just Cause 2 $4.99 (75% off)
{pf id:81115 size:small} NBA 2K12 $5.00 (75% off)
{pf id:3188 size:small} Napoleon: Total War $5.00 (75% off)
{pf id:1203 size:small} Arcania - Gothic 4 $5.00 (75% off)
{pf id:54185 size:small} Deus Ex: Human Revolution $7.49 (75% off)
{pf id:84731 size:small} Quantum Conundrum $3.75 (75% off)
Thief: Deadly Shadows $4.99 (75% off)
Hitman: Codename 47 $2.49 (75% off)
Hitman 2: Silent Assassin $2.49 (75% off)
Hitman: Contracts $2.49 (75% off)
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Green Man Gaming
20% off any title via code "DERHE-RRDER-RINGE"
GOG
50% off strategy titles
https://www.techspot.com/news/49999-weekend-game-deals-me3-16-crysis-pack-15-gta-iv-mp3-30.html