Who sells lock cylinders? (Other than MB dealers.)

[BrettS]

The door lock cylinder on my '91 190E's driver-side door broke (the key doesn't do anything in that door now). I checked my parts car, and both of the lock cylinders on it are broken in the same way (seems it may be a design flaw).

I'm trying to track one down. The only place I've found, so far, that can get them is the dealer. They want $267 for it. I was hoping to find one for significantly less than that.

Any tips on where to find these?

Thanks.
Brett