I've seen CF trim occasionally on sale in the forum classifieds. If not, Tischer (www.getbmwparts.com
) should have it for order - and you can figure out the part numbers from www.realoem.com
The M3 trim is identical to the 3 series trim, except the center console trim which is leather in the M3 (and should stay that way IMO). So all you need to buy is the dash & door trim.