My 4th pizza stone cracked last night

I've had it with those things. I'm very gentle with them, but they break in the oven, usually with a pizza on them. I want to get some thick tiles, but last time I went all over town looking for them, nobody had anything I would cook on. Everything was glazed, and 1' x 1', which is too small to cook a pizza on. Can someone give me advice on how to acquire good thick quarry tiles for my oven? I live out in the sticks, so I'd prefer to order them online. Thanks,
-Tim