You have a couple of choices. You can get a MB shop manual on CD from 1-800-FOR MERCedes. I'm not sure of the cost but I think it's under $100.

You can also subscribe to www.alldatadiy.com for about $26 per year.

I don't have both so I can't compare. I find the MB DVD for W210 to be very useful.

Beware there are some inexpensive CD's on eBay but most report they are not worth the money.