Just put these front splitters on today. Got them for $90 + $30 shipping on eBay.
http://www.ebay.com/itm/Carbon-Fiber...ff6098&vxp=mtr
The are fiberglass with carbon laid on the leading edge. Thin, but fairly rigid. They didn't come pre-drilled for use with the factory screw holes. Made a cardboard template to line one side up. First fit I was a bit off so I had to make the holes slightly bigger. After finishing the drivers side, I just traced the final holes onto the passenger. Also had to make a new hole by the innermost leading edge to get it tight to the bumper. Think they look great for under $100... better than paying $800 for the BMW ones.
Anyone who's interested in getting these, let me know. I'll take one off and make a template to save you some time on the holes..