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Mac Game Store has some deals up.
Civilization V: The Complete Edition $12.25 (Steam)
Paradox Sale
Cities in Motion 2 $5 (Steam)
Cities in MOtion 2 DLC 75% off. (Steam)
Cities in Motion 2 Collection $10 (Steam)
Crusader Kings II $20 (Steam)
Crusader Kings II DLC 50% off. (Steam)
Europa Universalis IV $10 (Steam)
Leviathan: Warships $2.49 (Steam)
Teleglitch: Die More Edition $3.24 (Steam)
The Showdown Effect $2.49 (Steam)
The Showdown Effect Deluxe Edition $5 (Steam)