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The Humble Store has a Shooter Midweek Sale running.
Aliens: Colonial Marines $3.74 (Steam)
Bedlam $10 (Steam)
Duke Nukem 3D: Megaton Edition $2 (Steam)
Heavy Bullets $2 (Steam, DRM Free)
Insurgency $7.49 (Steam)
Natural Selection 2 $6.24 (Steam)
Painkiller Complete Pack $14 (Steam)
Painkiller Overdose $1.24 (Steam)
Painkiller Redemption $1.24 (Steam)
Painkiller Resurrection $2.49 (Steam)
Painkiller: Black Edition $2.49 (Steam)
Painkiller: Hell & Damnation $5 (Steam)
Painkiller: Hell & Damnation Collector’s Edition $7.49 (Steam)
Painkiller: Recurring Evil $2.49 (Steam)
POSTAL 2 $1 (Steam)
POSTAL 2: Paradise Lost $6.79 (Steam)
Screencheat $7.49 (Steam, DRM Free)
Screencheat 4 – Pack $22.49 (Steam, DRM Free)
Screencheat Humble Deluxe Edition $12.49 (Steam, DRM Free)
Serious Sam 2 $2 (Steam)
Serious Sam 3: BFE $8 (Steam)
Serious Sam HD: The First Encounter $3 (Steam)
Serious Sam HD: The Second Encounter $3 (Steam)
Shadow Warrior Classic Redux $2 (Steam)
Sniper Elite 3 $25 (Steam)
Sniper Elite V2 $10.19 (Steam)
System Shock 2 $1.49 (Steam)
TOXIKK $16.14 (Steam)
Ziggurat $7.49 (Steam)