The MB factory manuals (except the transmission volume) for the W124 series in CD form are available from MB or from other vendors like FastLane (see the link at the top of this page).

You might get lucky finding hardcopies on eBay or from www.adsitco.com.

There are a couple other third party hardcopy W124 manuals besides the Haynes manual. Check amazon.com or Barnes & Noble.

Sixto
95 S420
91 300SE
87 300SDL
83 300SD