$300???? Comon! I bought my 2K front doorglasses for $34.00 dollars EACH, I keep and extra set for MVInspection re: window tint.
Doorpanel off, its 2 bolts, takes me maybe 5 minutes a side. (NOTE- I used to own a glass shop in NJ, but the glass was purchased after)

I cannot see the rear doors being much more. Dont do insurance, go pay cash and get it over with.

M