Amazon offers the Mr. Heater Buddy Propane Heater, model no. F232000, for $69.99 with free shipping. That's the lowest total price we could find by $10, although it was $7 less in October. This 4,000-9,000-BTU portable, indoor-safe radiant heater has failsafes such as auto low-oxygen and auto tip-over shutoffs, and claims heat coverage for 200 square feet.