I bought an M3 lip spoiler and adhesive strip from Pacific BMW in Glendale, CA. I expect to receive those items today. The purchase price and shipping by UPS of both these items from there to my home in Tucson was less than the local dealership would sell the lip spoiler for, even though they have it in stock. The local dealership said 20% off list was as low as they would go. Pacific BMW won my business.
I think the small OEM BMW M3 spoiler is an understated item that just adds a touch of uniqueness to the car. Incidentally, I recently took delivery of a ZHP coupe - the first in Tucson. (I ordered it and it was manufactured on March 2.) It did not come in with the lip spoiler as the ZHP sedans have. I like the car very much but like the look of the lip spoiler. The salesman told me that unlike the sedans, the coupes will not come from the factory with the lip spoiler. No problem. I've bought my own. It will be painted and installed ASAP.