I just had lunch at Portland Pie Company in Portland, ME for the first time, and their gluten free pizza is absolutely phenominal. It’s expensive at $13 for a 9 or 10″ pizza, but it’s loaded with toppings and is actually filling, which can be a problem with GF crusts. It’s also got exactly the spongey flexible feel that most GF pizzas lack, which seats it comfortably as the best GF pizza I know of. If you live in the Portland area (or Scarborough or Westbrook) go there and buy lots so they keep it on the menu.