iPod Kit from Mercedes C230 06

Does anyone have / know of a source to purchase the Mercedes iPod Kit for the 06 - C230 ?
 
I went to the dealer and they want $650 installed for the kit.  I've done some reading here on the forum and read people installed it themself and took the Benz to the dealer to have the ipod fuctions turned on via their computer programmer.  I've done work on these benz's before, but I don't know where to pick up the factory / stock iPod Kit for this C-Class at a great price, rather the dealers $650... if it came with a free nigth at the strip club, i probably wouldn't mind paying that but $650 is seriously outrageous for an interface and cable.  You can buy and entire PC at any big box store for that much money or about three ipod nano's.... 
 
Any help guys/gals would be much appreciated.
 
Thank you,
 
Steve

try k1motersports
i boght one for my c240 complete integration half the amount than from the dealer