There are a bunch of DIY videos out there. I built one this season out of an old full size freezer and it worked great. You could probably pick up an old freezer cheap, some people just give them away if you pick them up. It only took me about 45 minutes to put together. Took longer to clean the freezer than anything else. Due to the size I used 11 inch flexwatt and a couple computer fans. Of course I used a quality thermostat but also used 2 thermometers to monitor it all. The temps were always spot on 89 degrees. I think it ran me $150 or so. You just gotta figure out your budget, and space as well as size you'll need. Mine for example can fit 13 big clutches or 20 small ones. Good Luck and have fun.