I have the MB factory chassis manuals for the 123, 116, and had them for the 114/115.

I have never seen anything better. They are worth any price, but I own all mine for less than 75 per set.
I also found the engine manuals for the 4.5, 3.8, and for the 61x diesels.
All are excellent resources.

If you want to search craigslist a region at a time for them use:

crazedlist.org

It will NOT work with internet explorer though. Works on Firefox.

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1959 Gravely LI, 1963 Gravely L8, 1973 Gravely C12
1982 380SL
1978 450 SEL 6.9 euro restoration at 63% and climbing
1987 300 D
2005 CDI European Delivery
2006 CDI Handed down to daughter
2007 GL CDI. Wifes