I know there a few good places like autohauz to get parts/supplies online, but my nearby dealer used to have an online site where you could buy direct, and you could find parts that somewhere like autohauz would not have, like OEM plastic fittings, and other stuff.

I remember I had seen some other dealership have a website too, but I forget the name now - is there anywhere like this? With an online database of parts from Mercedes? The one I knew I can no longer find!