For in-store pickup only, Tractor Supply Co. offers the Mr. Heater Big Buddy Radiant Portable Heater, model no. F274800, for $99.99. That's $28 under the lowest shipped price we could find. This propane heater features an output of 18,000 BTUs that can heat an area up to 400 square feet and failsafes such as auto low-oxygen and auto tip-over shutoffs.