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Easily available from McMaster-Carr
See Pages 3445 and 3446 for a wide selection of clear, fluorescent and opaque acrylic. 12"x24" sheets are the max size for the Epilog Mini 24.
Sloan's woodshop has 1/16" acrylic in white/black/redtrans
There are also stores that carry acrylic sheet!
Anodized aluminum in various colors, sold as Anodized name plate ($1.25 each) @ Laserbits.
Anodized aluminum business cards for $.50 each, bulk anodized aluminum tags of multiple sizes, shapes and colors: Chewbarkas eBay store
Anodized Tags in various colors - $0.69 each direct link @ Laserbits.
Anodized and powder coat dog tags for as little as $.25 each when purchased in quantity: Chewbarkas eBay store
Leatherman tools - for bulk orders of Leatherman tools to etch, we used Moon Trail (recommended by Leatherman).
Big NO-NO material with laser. The fumes from PVC is toxic and filter won’t help.
For safety reason, you may want to request the MSDS (Material Safety Data Sheet) to check if a “plastic” matieral contains PVC