Does that seem correct?

I am guessing brakes are done, new filters....alignment of tires.

Although I noticed most seem to have paid around 300-400. Does this seem right, also my next service should be about $200, but I am not sure if that was just to lesson the shock of this one.

Seem about right? I assume its too late to negotiate etc since its already in.

20k mile service btw

 

If its like my dealership, I suggest you fill up and enjoy plenty of complimentary cold beverages and the warm cookies.

Otherwise, I think you're too late.

 

20k should be the B service which consists of an oil change and brake fluid flush.

in the central CA area that's about a $450 to $500 job. ($350ish for B service and $100 to $150 for brake flush).

 

A lot has to do with whether or not they performed Required or Recommended maintenance per the MB Maintenance Manual. Recommended does more and therefore costs more, but MB says you don't have to get it done.
BTW, my dealer charges extra for rotations, alignments, etc. A "B" service is about $400 and includes new air and cabin filters as well as the brake flush and "A" service items.
Really need to talk with service advisor about how much the 4th service costs (4 years or 40,000 miles). They do all the "B" stuff plus a transmission service.