Erratic Starting 318i

I have a 1995 318i, automatic, and in the recent past there was a starting problem....occasionally it would take two attempts of turning the ignition
to the third postion in order for the starter to engage. A new starter was installed, and so far all works well, but in the event it happens again, has there been any history of recurrent problems with the 1995 318 key ignition....if so, any idea how much it would cost to replace with a new key ignition??
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