Well, if anyone is looking for a garage heater, the Mr Heater Big MAXX ones are 20% off at my Lowes, and maybe yours, until 3/2. They come in Natural Gas models with a kit to change to Propane. They also include a thermostat, although I am told adding a low temp. one is something to consider if you want to keep the space a lower temperature part of the time.
Of course you will need venting (A vertical kit is available for $99) and piping for the gas supply and an electrical connection (120V), and wiring for the thermostat.
I just picked up a 50,000 BTUH unit (MHU50NG) for $309.60 plus tax. I see it online for $499.
I got that by getting the 20% off of the posted price of $430, which made it $344, and then used a 10% moving coupon, which also applied to the vent kit and all the other bits and pieces I needed for installation.
If you can't get the 10%, if you charge it on your Lowes card, then you can get 5% off the entire order.
They have larger units too.
I didn't find this online, but by going into the store and asking for garage heaters.
They were on an end cap for clearance items in the outdoor and seasonal section. YMMV.