tile

Hi, I am having a huge problem finding ANYONE in my area (Orange County, NY) who has any idea what I'm talking about when I ask for unglazed tiles, like the quarry stone I've heard so much about on this website, that is suitable for baking. I am currently working with a Pampered Chef pizza stone, and while I have to say it has taken quite a bit of abuse and held up well, it's not suited to my needs. First of all, it's round, and fairly small (24" diameter I think), which limits me, and is very frustrating.