Make your own very easy. Go to a 99 cent store or 1.99 store and buy the cheap windshield reflectors, the shiny ones. I have two layers of it on my hood and it works great. You cut it to the size you need, and can easily shape it. Use the aluminum tape to tape it to hood. In my room I have a thermometer on my hood that reads 72. My room stays at 72 as long as the outside air temp is below 84. My intake is from a cool place. I am also running a 1000 watt hps and a 1000 watt mh for 6 hours every day cycle.

But the cheap windshield reflectors work great because you can layer on many for only a few bucks and they really do work. If cut properly it can look very professional.

The following pics are from a legal medical grow, making sure to follow all laws and regulations.