Classic Industries says they have them in stock for 179.99. And they have a sale up to 25% off if your order is over 199.00. (some restrictions apply). Worth a look
GN110245T - 1978-88 G-Body Windshield Glass With Antenna
Reproduction windshield glass for 1978-88 G-Body models. Manufactured to factory specifications, featuring correct contours, and thickness. Band at the top of the glass is blue/green colored.
www.classicindustries.com