Back in the 1960s to 1990s 1 pound cannisters of R-12 refrigerant were sold everywhere for $!.00 or less.
They were even sold at boat supply stores to power hand held air horns.
Model rockets made by Vashon were propelled by freon, to give the look of liquid-fueled rockets emitting fog. The bodies were aluminum containers, not cardboard.
http://brotoro.com/vashon/index.html