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GamersGate / GamersGate UK has some deals up for the day/weekend.
Daily deal for 10/2
The Cave $3.75 (Steam)
Middle-Earth Weekend Deal
Middle-earth: Shadow of Mordor Game of the Year Edition $25 (Steam)
Middle-earth: Shadow of Mordor $25 (Steam)
Middle-earth: Shadow of Mordor Season Pass $12.50 (Steam)
Lords of the Rings: War in North $5 (Steam)
Guardians of Middle-earth $5 (Steam)
Plus more deals…
Shelter Weekend Deal
Shelter: Complete Edition $22.49 (Steam)
Shelter $2.50 (Steam)
Shelter 2 $11.24 (Steam)
Shelter: The Heart Edition $15 (Steam)
Pid $2.50 (Steam)
The Blue Flamingo $1.25 (Steam)
Train Simulator 2016 Add-On Sale
Train Simulator DLC is on sale for 50% off for the weekend.