paid $3200 for mine at a Chrysler dealer where it had been traded in. They knew absolutely nothing about Mercedes and were planning to wholesale it out. It had about 130k on it with a few minor problems like malfunctioning odometer and vacuum leaks in the heating system but nothing major. I was expecting to pay considerably more for something in that kind of condition.
I had seen many for sale in the $4-5000 range with double that many miles on them.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13