I had a local Mercedes shop (not dealer related, butindividually owned) install my DVD NAV and he charged me about $60 including resetting the code on the radio. Bought the unit new/unopened box on eBay about 6 months ago for about $650 including new disk. That is about as frugal as it gets. Worked perfectly from the time I left the shop!
Good luck,
Bob
Good luck,
Bob