I have the MB FSM Vol 1 & 2 for the W123, the FSM Diesel engine 617.95, the FSM for the heat/ac type one, two and three, the FSM for the electrical year model 83 - 85. and several others I have picked up along the way for some of the older models. some are a Hard Back book.
I like the paper manuals, easier to find what I want flipping through the pages vs a CD. once you have found what you want, then print the pages from the CD, and use them when out wrenching on the vehicles. this keep the manuals from getting greasy.
Iam always on the hunt when I go to flea markets, Swap meets and Car Shows. never know what you will find.
MB has these small technical manuals about 4" X 6" that have a lot of info for each year models. there was a guy that had about 20 of them for $5 ea, and I only bought about 7 of them. then was kicking my butt for not buying them all.
There is a good-Guys car show next weekend, maybe he will be there again in the swap meet area.
Charlie