I found mine online http://www.sunoven.com/. It came with a cookbook and a special black pot to cook in. Cost me about $300 I think but that was several years ago. Definitely worth while in my opinion!
Wow this is ingenious. Where do you buy a solar oven and how much do they cost?
I stir it every hour or so just to make sure it doesn't stick. I generally re-position it about the same time so it's handy to do it all at once.
WOW, cool. Do you stir it when your cooking or just let it go?