Sunshades are actually really easy to make for about $50. Home Depot, Lowe's, or any similar big brand store sells rolls of screen. I used pet screen because it was really sturdy, but you can get any kind you want including UV screen. The rolls are about 48" or so wide, which is perfect for a JK. You will have to cut to length but it is easy to do. Buy a grommet kit, some grommets, and a bunch of ball bungies and you are set. If you know how to sew you can strengthen the edges with some webbing. Seriously, the whole project isn't very difficult and you can save a bunch of money for other mods.
That said, if I was going to buy one I would probably get a Dirty Dog.