A friend of mine purchased Bart's car and he recently changed to a Vorsteiner trunk. Nothing is wrong with the trunk. We aren't sure of the material but since it was on Bart's car, I'm certain it wasn't a cheap replica.
Price is $500.
Pictures are here: http://www.m3post.com/forums/showthread.php?t=626670
PM if you want to see it in person.
It does include a rondel and M3 badge.