Echoing what others have already said, replacing shocks is an easy DIY job. Total time for my SDL was ~3 hours, and that included wrestling rusted nuts off the rear factory shocks and a break for supper. Bilstein HD's all 4 corners and the car rides and drives like a dream.

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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]