I believe California Pizza Kitchen started offering a gluten free pizza at their restaurants, but I haven't seen any gluten free offerings from them in the frozen section of our grocery stores yet. Many grocery stores these days have a section of gluten free bread products including pizza dough, which might be a more cost effective route than going out to eat. Plus you can supply all the fresh toppings you like.
I've never tried making a gluten free pizza dough from scratch, but I do recall seeing a rather detailed recipe on the America's Test Kitchen site, it was a video recipe, and the cooking technique was rather interesting. The "dough" they made was actually more like a batter which they ladled on to the pizza tray and baked it once first by itself, then they added the sauce and toppings and baked it again. Despite it starting out as a batter, they wound up with a firm crunchy crust.