C-Service cost for '06 ML500?? - interested in pre-owned w/ 13K - please read!!

[tcrown18]

Question...i'm looking at and test drove an '06 ML500 & while i test drove it a message popped up saying it needed a C-Service. The car has 13000 miles, and is for sale at a local Volvo dealer for $45,900. How much would a C-Service cost if I have it performed at a Benz dealer?? Also, is the price good that they offered - the car is fully loaded (18" wheels, Nav., parking sensors, keyless entry & start, etc.).

Any help would be appreciated!!

Thank you!!