Here's what appears to be a fully dressed one for $5,900.

http://www.ebay.com/itm/MERCEDES-S600-CL600-SL600-V12-ENGINE-MOTOR-SUPER-CHARGE-TURBO-ASSEMBLY-W220-/121274725616?pt=Motors_Car_Truck_Parts_Accessories&hash=item1c3c8974f0&vxp=mtr