Along with the usual weekend deals, Plants vs. Zombies is still free at Origin while Splinter Cell: Blacklist is $9.99 and Age of Empires III is $3.99 this afternoon only at The Humble Store. Meanwhile, Chivalry is $8.74 with free access for the weekend at Steam, both Dragon Age games are $12.49 via Amazon, Dishonored is $5 at GameFly, GMG has XCOM deals and Far Cry 3 is $10 at Get Games.

Steam
82  Chivalry: Complete Pack $8.74 (75% off + free weekend)
76  Arma 2 Complete Collection $7.99 (80% off)
80 Arma 3 $35.99 (40% off)
90 The Stanley Parable $7.49 (50% off)
75  FlatOut: Ultimate Carnage $4.99 (75% off)
87 Deus Ex: Human Revolution Director's Cut $4.99 (75% off)
Desktop Dungeons $7.49 (50% off)
Sacred Gold $1.49 (85% off)
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Amazon Digital
90 Dragon Age Pack $12.49 (75% off)
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GameStop
88 Left 4 Dead 2 $6.79 (66% off)
88 Half-Life Complete $13.59 (66% off)
74 Typing of the Dead: Overkill $9.99 (50% off)
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GamersGate
79 R.U.S.E. Collection $4.00 (75% off)
85 Europa Universalis IV Digital Extreme Edition $11.25 (75% off)
85 Trials Evolution: Gold Edition $11.97 (40% off)
61 F1 Race Stars $4.99 (75% off)
62 Silent Hunter 5: Battle of the Atlantic Gold Edition $5.97 (40% off)
86 Rocksmith 2014 $35.99 (40% off)
I Am Alive $8.97 (40% off)
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GameFly
91 Dishonored $4.99 (75% off)
Car Mechanic Simulator 2014 $9.99 (50% off)
Kalypso Media Collection $49.99 (85% off)
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Green Man Gaming
77 The Bridge $3.99 (60% off)
69 The Bureau: XCOM Declassified $4.99 (75% off)
84 XCOM: Enemy Within $14.99 (50% off)
88 XCOM: Enemy Unknown $9.89 (67% off)
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The Humble Store
82 Splinter Cell: Blacklist $9.99 (66% off)
87 Antichamber $4.99 (75% off)
88 Tomb Raider GotY $7.49 (75% off)
78 Capsized $1.99 (80% off)
84 Age of Empires III $3.99 (90% off)
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Get Games
88 Far Cry 3 Deluxe Edition $9.99 (75% off)
81 Far Cry 3: Blood Dragon $3.74 (75% off)
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GOG
Up to 70% off assorted titles