They're becoming easier to find these days. Check a kitchen supply store. Some stones are round, others are square. Make sure the one you select fits in your oven - or on your barbecue grill.
Pizza wheels make quick work of slicing the perfect pie.
They are available in kitchen shops and commercial outlets. The best pizza pan is a cast iron skillet. Lodge is recommended. Non-stick pans solve any sticking problems but the pizza cannot be cut in the pan. Lightweight, untreated aluminum pans are great for thin and crisp pizzas.