Just out of curiosity, what are different MB dealers charging for the A and B services in different areas of the country? I did a quick survey of the four local dealers and got the following qoute ranges:

A Service Range = $210 - 260 plus tax and "additional parts"
B Service Range = $380 - 550 plus tax and "additional parts"

An independent quoted $125 for the A service and $325 for the B service.