I've been finding the dealer to be the same price or cheaper as well. I asked one locksmith why the same price as the dealership, which was a two blocks away, and he said (in a nasty way) he had to pay for the special cutting machine somehow.......and I said see ya.

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Rick

'85 380 SL (sold)
'85 Carrera Flatnose
'71 280 SL Signal Red/Cognac