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PayWUW has the Working Simulation Bundle live at their site.
Pay $1 minimum for:
Agricultural Simulator 2013
Airport Simulator 2014
Towtruck Simulator 2015
Woodcutter Simulator 2013
Pay $9.99 or more for:
Professional Farmer 2014 CE
Historical Farm and Farm Giant
All titles activate on Steam.
Thanks to reader Indra for the heads up on the deal.