Ouch, Try the online window/winshield services. A friend just got a new one installed for about $200 total. I think it was winshield.net, or something similar
I actually got a TR7/8 windshield from one of those vans that rides aroudn and installs for cheaper than the online parts houses. Not saying you will too, but it's worth a call.
Call your insurance agent and see who does all their bulk work. Usually the best deal. Then make sure you get plain without all the tint, shade, and other add ons. Put your vinvl at the top and go. I paid $170 for the last one I got.