One other source is the Trotec materials site. (https://www.engraving-supplies.com/) It’s a somewhat strange site in some ways, but a pretty good selection of materials that should be safe for laser. Links to a lot of good laser information.
@shollg Thanks for the links…Johnson does a huge selection, I’ve bookmarked that one. I have bought one sheet of the inventables stuff to try. I’ll post a picture once I try it out.
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