Nello's Pizza has four locations in Arizona. Each location is independently owned and operated. Therefore each location might have slight differences in their menu and pricing. The Phoenix location offers gluten free pizza. Check out their menu here: www.nellospizza.com/food/
The Scottsdale location offers gluten pizza. According to their website (www.nellosscottsdale.com), the gluten free ingredients are made at a certified gluten free facility. However, although, they make every effort to prevent cross contamination, they cannot guarantee that the gluten free menu items are 100% gluten free.
The Mesa location also has gluten free crust available. According to their website (www.nellospizzamesa.com), they prepare their gluten free menu items on dedicated surfaces and cookware, but they cannot guarantee that all items are completely gluten free because of the risk of cross contamination in their shared kitchen.