I agree with Black300CD, a pre-purchase inspection is well worth the money.

Check out this car in the Autotrader:
Year: 1984
Make: MERCEDES-BENZ
Model: 300SD
Model Detail:
Price: $1,500
Mileage: ------- km
Date: 1/29/2005
Ad Type: Private
Comment: Car is MINT! Carefully maint by owner, all orig., it is a must see car, diesel, auto, blue leather, everything still working, great on fuel!! Asking $1500 obo. (416)209-7171 (416)283-5475 jetta_g60_is@hotmail.com

Picture looks good too, but not sure about the kms. For $1500 though

Good luck with your search.