WARNING: THREAD DRIFT AHEAD!
Automobile glass marketing is a strange animal, to put is kindly.
Industry standard is that insurance take a 50% discount on all glass bills they cover.
So, PPG, Saf-T-Lite, et al, doubled the price of the glass:
Dealer/Shop purchases glass for $100, and sells for $150. Until insurance companies start their 50%. New pricing, Dealer/Shop pays $100, and sells for $300, and gets paid $150.
Tab, Shop your window replacement, and make sure they understand this is out of pocket, with no insurance coverage.