Woot offers Ryobi PCL801 18V ONE+ Hybrid Forced Air Propane Heater for $89.99 (reg. $109.99) free shipping with Prime. 

Product Description:
Up To 2,500 sq. ft. Of Heating Coverage With Up To 60,000 BTU Hybrid Technology For Use With Any 18V ONE+ Battery Or Extension Cord Over 260 ONE+ Products – All Work With Any RYOBI 18V ONE+ Battery Expand your RYOBI 18V ONE+ System with the RYOBI 18V ONE+ Hybrid Forced Air Propane Heater. Chilly job sites, construction sites or outdoor events are a thing of the past with heat coverage spanning up to 2,500 sq. ft. This heater features a temperature control dial allowing for 30,000 - 60,000 BTU to customize heat output and has the ability to run on any RYOBI ONE+ battery or extension cord. The durable metal construction and integrated carry handle makes it the ideal outdoor heating solution while maintaining portability and convenience. Electronic ignition for easy, worry-free start-up every time. Best of all, it is part of the RYOBI ONE+ System of over 260 cordless products that all work on the same battery platform. This 18V ONE+Hybrid Forced Air Propane Heater is backed by the RYOBI 3-Year Manufacturer's Warranty