Try anywhere that makes windows for houses. We used Marguard windows in forestry equipment when i drove a harvester and we just bought sheets from a window supplier and cut them to size with a jigsaw. Anywhere that sells large machinery should be able to get it for you too. It is slow going trying to cut the stuff. You have to cut at a slow speed with water running over it to stop it melting and ruining your blade.
I would check the cams regulations regarding thickness. At a guess i would say 5mm would do.
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