Have a look at this thread incase it has any info. to offer you.
I am replacing my windshield in the spring and by getting it from the dealer (staff discount from a friend) it will be just over $200.00. I will buy the gasket also and have the work done by a Mobile Windshield expert I was referred to and discussed the job with. I heard great things about him, he was pleasant when I spoke to him, and I really liked that he works for Dealerships but can come do it at your place if you arrange it with him personally.
Here is his contact if you would like to check with him:
Jonathan Alfred 416-451-9679
He offered to supply PPG glass for me, but I wanted the oem BMW glass with logo ect. and at Dealer cost it is actually pretty cheap, otherwise I would have gone with the PPG from him (Heard great stuff about the PPG glass also). All in all when I added it up it was a better deal/cheaper to do it this way with OEM glass from BMW then going aftermarket with any of the windshield shops I called for the job.