Jpinet,
Always check with the MB dealership first if a part is still
a) available
b) parts number correct or changed
c) price
d) availablilty.
Then, and only then you can decide on your own where to get the part, from Bud's, KK or elsewhere if you dislike the official dealership.
But please do your homework and check first with MB (best is with Classic Center in Irivine, CA). It's well worth the effort.
Many of the independent sellers request ridiculous prices or at least the corret MB factory list prices for an OEM MB part.
Often, the CC can provide you a discount.
The 230 camshaft A180 051 8401 is still available from the factory.
Here is the current price (as of 20 Jan 2015), maybe a bit more expensive tomorrow.
Do a conversion from € into $$, add a bit of surplus because of transcontinental shipment, then you know what the part is roughly worth in the States.
Good luck!
Achim
(parts aficionado)