Here is another kit that turns your grill into a pizza oven. The BakerStone Pizza Box lets you bake delicious pizzas in 4 minutes. It can fit up to a 11″ pizza. You can also use it to roast meats, fish, and vegetables. It can reach temperatures from 600 to 800F.
Simply bring your gas range, and you are set. The Pizza Oven Box costs under $130 at this time.