check out San diego craigslist. Or any southern california craigslist posting. Lots of good ol diesels, most are rust free, some are still owned by the original owner. Good place to start.

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1982 240 D, 308,000 - 321,127 miles (sold)
1982 300 TD,166,500 - 226,000 miles
1998 E 320, 120,000 - 144,000 miles
2005 C 230 K, 26,000 - 77,000 miles (sold)