I'd check with one of the forum member sponsors like getbmwparts.com (Tischer) or contact Phil at ReevesBMW or Dan at United as they have great prices for us and so they might be like $100-125 maybe? If you check out some people's pics in the 135is picture threads there are some good pics to give you an idea. Actually, here, I'll use mb135is's pic since his is space gray with coral red to give you a good idea of how it would look. Hope that helps.
http://i10.photobucket.com/albums/a1...08c40d5add.jpg
Here's another one as well:
http://www.1addicts.com/forums/attac...1&d=1348589045