Hey Vince,
So for Local stuff.
Home Depot - Thin Clear Acrylic, thin Hobby plywood.
Lowes -- Same as Home Depot.
Rockler -- multitudes of sizes and Species of Woods.
Woodcraft -- Same as Rockler.
tandy Leather -- for all your leather needs.. (
https://tandyleather.com/pages/store-locator)
Look for a local Mill or Lumber store as well.
See if the Space has someone with access to a local JDS Or Marco location, or if you are there long enough Johnson Premie Plastics
Note : that you need a Business License to access atleast JDS, so that may or may not be an option.
JDS -
https://www.jdsindustries.com/index.php?view=locationsMarco -
https://marcoawardsgroup.com/locationsJPP -
https://www.jpplus.com/locations/you might also find a Regal or COPE plastics Locally.
As for a list of things to stay away from. PVC, Vinyl are the two really serious things to avoid, as the Fumes are Both Toxic and damaging to the laser. other than that, anything that produces Toxic Fumes that can't be properly disposed of.
frank