You should wait around for the MSport. They are rare but available. It is not worth the money to convert when the purchase price for used is close to non MSport. I had found a 2010 M Sport Coupe (but auto) loaded for 35k at BMW dealership and it only had 17k miles. Keep searching but if you settle, you might regret it.
Current | 2011 E92 M3 - Mineral White, Black
Sold! | 2011 E92 335is - Titanium Silver, Black
Sold! | 2007 E92 335i - Space Gray, Black
Sold! | 2008 E90 M3 - Jerez Black, Fox Red