Here in the UK i have tried; Pizza hut, Dominoes and Pizza Express. (They are premade in packets and half the size of what u normally get) Sadly because of the wheat flour in the air these have always turned out a bad choice for me. We have a shop called Marks and Spencers here and their pizza bases are lovely, not like the cardboard ones you usually find. Online shopiing, ebay and amazon are the best ways to find new brands. Online you have more variety from your local supermarket (if this is available where you live) Also gluten free wraps are ideal for just a thin based cheese pizza. We make these for snacks. I've tried at least 20 different methods of making the base myself but im sold with the Marks and Spencer ones now.
Best of luck!