At Home Depot today I found (and bought!) a portable radiant heater that competes with this one:
For only $35 dollars. It's a knock off by some outfit called "dyna-glo" takes the same 1 pound bottles as the famous "buddy heater" above. They had a knock off of the "big buddy" for $55.
They also had competition for this heater:
For only $9 but I didn't get that one.
Better hurry. My store only had 2 left, and I got one of them!