I made my own...sure I have to re-do them about once a year, but it's cheap. Spend an hour or so experimenting with cutting a pattern to fit. Then use a foam board (available at craft stores such as Michaels) that is black on one side, white on the other. Cut it just slightly larger than your pattern. Then when wedged in place as you put t-tops on, the shade is held in place. Black side interior, white side facing the sun. I've done this for four years.