I haven't priced one in a while, but there was a glass distributor that would go to several of the bigger swap meets around here and would deliver to the show if you ordered ahead of time. If I recall, their prices were less than $300, but that was 5 years ago or more. Brand new windshields, so it's not like a NOS supply problem. I can't remember the name of the company, but they advertised in Hemmings & the like. Hopefully someone else will have a source for you, but I'll keep looking.

Good luck!

Clair