I bought my windshield from Richard at ProSource. He is on the forum in classifieds. I looked around at other options - My car is an 89 which uses a later 964 style windshield, and a little more expensive than earlier models. It was tinted glass with tint strip on top and antennae. It was $470 plus $25 crate fee and $145 shipping to NY from MA. I drove down to US to pick up.
I also checked at Suncoast Porsche, usually best price parts, they wanted $1100 plus shipping for stock. I did not check with dealer here in Canada.
Richard was a good guy to deal with.
ProSource Glass international
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Prosource Glass International