Does anyone know where you can either buy or rent a small spray foam set up? I need to insulate the joist cavities in a reno project. I have seen on DYI shows guys using 20lb propane style tanks to do exactly this kind of thing, but I have called the insulation suppliers I find in the phone book but no one has it. The job is to small to call out a spray foam contractor, they want a stupid price to come out. I am hoping for a couple hundred bucks I can find something. Any help would be great.