I don't know what the plastic used is, perhaps PP or LDPE. You can find sheets in any sizes and there are many suppliers that will cut them to size/shape and ship.
But none I've seen do a non-slip pattern, so I'm not sure how you can reproduce that, other than scoring or heat-forming it yourself, which should be doable but maybe tricky to work out.
You will also find that paint (or pretty much anything else) doesn't stick well to this plastic, so painting it is pretty much out.