Dave Poole on this site, told me about http://www.freddiestransmissions.com/ this trans shop in Dallas which is pretty good. They offered to rebuild mine for about $300 plus shipping. My problem is that I'm not sure it's the VB.
In any case it will always be cheaper to bring the VB into a trans shop familiar with MB then bringing the car in. When you bring the car in they have you over a barrel so to speak. Let me know how you make out.
Good Luck