Royzel:
I know you are in BC, but there is a great place in California called Sun Valley Mercedes Dismantlers. They will ship a completely rebuilt tranny with torque convertor for a competitive price. My 722.508 tranny on my 95 S320 went out and I had a local shop tear it down...by the time I figured out I would have a better deal with Sun Valley, I had spent more on the tear-down than I should have and was stuck to have the local shop repair it.
They will ship to your local shop for you.
Just a thought.
http://www.mercedesnewparts.com/
click on the link on the left "transmissions"