UNGLAZED TILES

Start searching tile stores in your area. As a good alternarive stores like Bed,Bath,and Beyond sell pizza stones. Same thing albeit a bit more expensive. Why do you think you need 4? One 12x12 is sufficient to do the job.

Your better off getting a pizza stone every unglazed tile i tried had so many impurities in it they shattered after a few cookings

Ask for firebrick splits. Or buy the pizza stone for the same money.

If you're near a very large city, there should be stores that sell nothing but tile in various forms, compared to the tiny selection of a Home Depot / Lowes.

I bought a whole box of 4x4 refractory tiles from Menards for less than one sandstone pizza stone. However years later when I went back for more they no longer carried them.

This topic gets covered a lot in the cooking forum. A small airbake cookie sheet works well too. The objective is to diffuse heat. I vote for tile or cookie sheet under the item being cooked. However, many put it on the metal plate above the burner. I've seen it crack the enamel on the oven diffuser doing it that way so I go with on a rack under the food or directly under the food if it is a tall item.

Quarry tile is the name most common for the unglazed tile.

Pizza stone. In a pinch you could use it to make a pizza.

air-bake X 2

Another vote for a pizza stone

Thanks to all who replied!!! I will look for quarry tile or firebrick splits. Thanks again.