I’ve been tracking used Mercedes Benz W123’s and W126’s since I became interested in biodiesel. I have found that Craigslist (CL) always has a few of new these 79-85 diesels listed. If you are not familiar with CL they are a free online classifieds that started in San Francisco and have expanded all over the world. Last time I checked they had 50 something US cities listed. Check www.craigslist.org. I have chronicled here, how to get a news feed reader to check all (at that time) the cities that CL lists. I also post some ebay and most CL listed w123 & w126 mbz’s.
Good luck in your search! I love the look of my ‘83 300TD. I just hope I can love the way it runs sometime soon. 
It’s in the shop right now.
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