replace car door windows with plastic windows.how much and where.
tap plastic.... can get what you need
depends where in the world you are, what car you have and are you doing it yourself
in the USA only a convertible can have plastic window rear only
Lexan acrilic sheet anywhere from 200-500 for a sheet. This is the stuff that nascar uses
You really need to consult a glazier before doing that. I have a friend who did that on a Volks Wagon Beetle street dragster and he can't keep the windows clean for anything. Most autoglass in the US is DOT regulated to be tempered, so aside from the safety aspect, I'm not sure why you'd want to.