So i thought i would go to lowes and get some stuff. low and behold, i find myself looking at ceramic tiles, so i decided i would pic up one or two...ok maybe i walked out with 7... anyway. so i wound up with 7 13x13 inch tiles that are all about 3/16- 1/4 inch. (havent measured) they were all super cheap, costing 1.26$ per tile. I think i will be able to get at least 10 big ones or many smaller ones out of each tile. Very worth it in my eyes, especially since im terrible at spalling out and winding up with waste material.