I've just looked at the pictures. She looks like a sweet car and worth saving but the rust behind the front wheels seems to me like it's going to need to be taken care of ASAP, especially if you've got corresponding amounts on the underbody (have you looked?).

For comparison, I paid $2,000 for mine in January but the rust around the front jack tubes isn't nearly that bad and amazingly there was only one underbody rust spot. I've got many more miles but it's 5 years newer, it's cleaner and things work (a/c, alternator, power antenna).

I'm new at this but my 2 cents is: Given that yours has to be towed I'd ask $750 and put it up on the "cars" section here...and be flexible. I'd guess you need to find a buyer who's interested in doing some body work themselves and has a grinder and welder.

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1982 240D automatic
Odometer quit at 307K...about 325K now