Available today: a Reznor unit heater.
Model F-165-E-H, 115VAC, 124,000BTU. $125.00
Reznor's F gas-fired, gravity-vented unit heaters are designed for ceiling suspension with a propeller fan for air delivery with 80% thermal efficiency. It may be used with natural or propane gas, as specified, in sizes from 25,000 to 400,000 BTUH gas input.
These items are stored in Erie, Colorado. I can bring them to Lakewood if that is closer to you.