I just bought one from MB Classic Center in California. It was not as expensive as the one they sell on some aftermarket tool house sites. With shipping I believe it was about $200.
Yes that is kind of steep, but I have no Benz dealer within 150 miles of my house and they have no interest in working on my old 86 300sdl. I believe they do not have a Technician who has ever seen a car as old as mine!!
There are no independent shops in my area either, so I bit the bullet and made the investment.
I enjoy my old classics very much, and I like to have the correct tools to work on them.

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John
1986 300sdl
1985 380se