I had added glass coverage to my P38 earlier this year. For us here in PA, you can add glass coverage as part of a sub-insurance package that is not full comprehensive but it covers "act of nature" type things like damage from hitting a deer and things like that.
So, my windscreen had a little chip, one slam of the door during a really cold morning and it went the whole way across the glass. Windscreen was replaced by Safelite Auto Glass under insurance. I believe the cost for the heated windscreen was around $650 to $750 (US), installation probably another $100.