Northern Tool offers the Mr. Heater Triple Burner Tank-Top Heater for $109.99. Opt for in-store pickup to dodge the $10.49 shipping fee. That's the lowest price we could find by $10, outside of the mention below. It mounts to 5-lb. to 20-lb. propane tanks (not included) and has a 10,000- to 45,000-BTU output.

A close price: Summit Racing via eBay has it for $110.97 with free shipping.