I found a package for my buddies C63 at less than half of the dealers price, so if you have one give me a call I'll be happy too help out as there isnt too many options on that car!
Price range depending on size and tire selection with OEM TPMS sensor will vary in between 2000 and 2750$. I got a phone call from someone this morning but the email adress you gave me doesn't work...