You don't say where you are located or what your mechanical abilities are, but that's OK. You can beat the delaer labor costs by using an Independant Mercedes Tech. There is a forum called Good Shops, search through there see if any shops local to you are listed. Choose a Tech as you would a Doctor, someone you trust. A good Indie shop can do just about everything the dealer can, at a fraction of the cost.
The other alternative is to do the work yourself. That really cuts the labor costs, but isn't an option if one doesn't have the ability.
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.