I had my driveshaft rebuilt by Driveline Service of Portland. They stock common Mercedes driveshafts(or at least the used to) They sent me a shipping tube to send it to them and I got it back in about a week.
http://www.driveshafts.com/products/Automotive-Parts/Remanufactured-Driveshafts

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Tony H
W111 280SE 3.5 Coupe
Manual transmission

Past cars:
Porsche 914 2.0
'64 Jaguar XKE Roadster
'57 Oval Window VW
'71 Toyota Hilux Pickup Truck-Dad bought new
'73 Toyota Celica GT