United Nuclear hasn't changed in decades. I remember buying thermite and other fun mixtures from them for my high school chemistry class experiments 15 or so years ago. Nowadays, you can probably find some of their products much cheaper elsewhere, but they've been selling these cool things for hobbyists for so many years, I like to support them.

And by them, I mean Bob Lazar,.. United Nuclear is his operation. (UFO guy who is likely viewed in a polarized fashion here, I myself am not into the conspiracies)