I used to use stoneware for pizza. When I went GF, I gave it away. I now use a (new) cast iron round griddle pan for pizza. Gives a great crust!
As for muffin pans, I didn't want to use stoneware or cast iron (heavy), so I just kept checking our local supermarkets and one of them eventually had a non-nonstick pan. They're usually aluminum, not steel, but I don't bake acidic things, so I'm not worried.
For baking sheets, I just buy restaurant supply style quarter and half sheets. I buy mine at an Amish market, but restaurant supply shops have them.
I have glass (pyrex) casserole and loaf pans. And you can find old breadpans at garage sales pretty easily. Most of mine are inherited.