I rigged up my own foam latex/spray booth out of a 5 piece box that was used to shipped vaccines with. The nice thing about this is that it comes pre-insulated so no need to add insulation foam or anything like that. For the heating element, I canabalised a toaster oven and kept all of the control panel in tact so I could use that for temperature adjustment and all of that good stuff. Here are a few pictures of what it looks like. I will be buying some insulation foam to close up the front portion of it soon.
Most people make their own s described above. A cheap toaster oven from the thrift store and a sheet of foil-covered insulation t make the box, is all you need.
You steal the heating element, and the thermistor (Temp Control) out of the oven and attach them to the new box. Add a thermometer, and a fan, and you're in business.