If you have an M Sport bumper and M Sport suspension, you are highly likely to scuff it on raised curbs
This is a very common area for scuffs
Either reverse in to spaces, or, as I do, use the bottom of the mirror / edge of curb as a guide to make sure you stop in advance, nothing worse than the awful sound of scraping pain on curb stone
re prices, you'll find some of the parts and their prices listed here:
http://realoem.com/bmw/partgrp.do?mo...92&hg=51&fg=75 (couldn't ascertain if yours is LCI or not, link is to pre lci E90 320d)