I paid $750 for my 240. It had ZERO brakes, and the master cylinder had a leaking secondary.
I put on new cheap rotors, top dollar napa brake pads, new master cylinder, changed all fluids and filters, then put around 3,000 miles on it before the tires started coming apart. Need new tires and some front end work. I miss driving the thing. For the shape it is in, it is pretty dang reliable.

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Mine-2008 6.7 Cummins; 1980 240D
Hers-1979 300D- Soon to be turbo'd