Last year I paid $1500 for a 528e with 250l miles, little rust on front fender, everything works, needs new speakers, and paint. Seller was son of the woman who bought it new, so I have original sales receipt and all maintenance records.
I got it out of the garage today after the longish Chicago winter, and it is a joy to drive. Once the battery was jumped, started right up. I am a happy guy today. Plus when I take it off road, I always have a bench to rest on --- the front bumper!