Not sure if you are looking for inside or outside but I got some from Wearhertech that sit inside. Black on one side, silver on the other and reversible.
I've made my own for the windshield and windows of our Freelander 20CB using Reflectix insulation.
Fairly inexpensive and they do a great job helping to keep the heat out or the heat in depending on weather conditions. They do double duty for privacy too!