You might as well get the whole M Aerodynamic kit if you want the M front bumper. I priced out just the front bumper and parts and the dealer quoted me almost 1200 dollars. The whole kit is 1250 from the dealer. Plus paint and install. Here's a thread with a few pictures....
http://www.e90post.com/forums/showthread.php?t=12753
Let me get mine installed on Tuesday, then I can figure out exactly what I have to sell (bumper/parts). Then I can get you a price.