On the 1st of the month when my money catches back up with my month, I have a printed page of templates that I am going to take to the glass shop just down the street. It is for a specific pattern. I also have a broken mirror that I will have cut into 2 rectangles that I will hinge together with duct tape.
I have bought template plastic and cut my own, but managed to shave them down bit by bit if not careful.