Mercedes Owners...high cost of service at dealer question?

Hi. I am currently leasing a Mercedes CLK 350 and the lease ends August 1st. My “Service B” indicator is showing up and I don’t want to pay the ridiculous price the dealer charges (about $600—$700) for this service. My question is, has anyone got their car serviced for much less at a local service station? If so, how much was it and did they reset the “Service B” indicator so that it goes away?