Mitchman, not sure if there is a good commercial plastics shop like Ridout near you but I think you can get it from these guys online. Consider which of these best fits you application. If you call the 800 # they might even give some advice. Also ask if there is a quick test to determine if your windshield is acrylic (that would be my guess) or a polycarbonate (Lexan)? For example ammonia will dissolve acrylic making the windshield cloudy...
Once you know what the windshield made of, say acrylic as opposed to a polycarbonate like Lexan, then go ahead and order your glue. I'm not sure if Lexan can be glued but if so, it will call for a different adhesive but they would have that on the website also.
http://www.eplastics.com/Plastic/Plexiglass_Glue
Good luck!