I checked about 18 months ago in the U.S. The windscreen itself was +/- $3,000. I've also heard that the gasket has to be replaced at the same time, which is not included in that cost. With the exchange rate and different labo(u)r costs this is probably pretty useless information, but perhaps it gives a magnitude...
I got the windscreen replaced last year in my 328 by Autoglass and I think that the cost was around £750.00. Can't see that a Mondial screen would cost any more than that. (It was a genuine OEM screen too) I claimed mine through my insurance so it only cost me the £50 excess. My insurance renewal was up a couple of months latter and for some strange reason the premium went down rather than up ?