GMG has some deals up at their site.
Use the voucher code SAVE23-WITHGM-GSEP15 for 23% off. Expires 9/4 (Hmm. Rocket League anyone?)
Use the voucher code MADMAX-SAVE40-MADMAX for 40% off Mad Max, which just got released. Should end up being about $36 after the voucher.
Car Mechanic Simulator 2015 $13.39
Car Mechanic Simulator 2015 – Visual Tuning $1.49
The Witcher 3: Wild Hunt $28 (GOG)
All games activate on Steam unless noted as otherwise.