If you're handy or mechanically inclined, don't be afraid to R&R the DV seals yourself. It's an afternoon project and depending on your skill level, can be done in a matter of hours. You're only out the seals (about $15), an intake manifold gasket, crossover pipe gasket, and fuel line (also a good idea to replace the return lines on the injectors at this time). Including freight, you're less than $75 for the job, including the tool to take the DV holders out.

Understandably not everyone feels up to working on the IP. If you aren't mechanically inclined or if you have a habit of breaking more than you fix, it's worth your time and cash to visit a reputable shop.

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Current stable:
1995 E320 157K (Nancy)
1983 500SL 125K (SLoL)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

Gone and wanting to forget:
1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]