Tell us about yourself!
How do you do to own a cat? I mean the cat who lives with me own me (at least she seems to think so) not the other way around.
Actually you go to your local flea market and buy a cheap broken camera, cut the bottom out and you'll have your tripod adapter. In my case since I want just to light a very dark shed I will attach the panel directly to the wall.
I think it is impossible to find nowadays since it can be used to make something heck more dangerous than black powder. For saltpeter you can find it in some very old stone houses basement, it's kind of a yellowish runoff, you scrap it from the wall toss it in distilled water filter the sand out and then dry it out again.