A lot of the ones on eBay are pure {naughty word}, and you'll have another hole in them in a few weeks.
Incidentally, just in case anybody's reading this and tearing their hair out about the mats constantly working their way forward, up under the pedals, I solved the problem on my TF by siliconing a sheet of hardboard to the bottom of the mat.
You can't see it, the mat never crumples or moves, and this seems to prevent wear too
