I had to have a door window with webs in it replaced when it suddenly ended up going to a million and one pieces. They came, went, and phoned to tell me the cost. I asked them about the ceramic glass costs. I was very surprised that these people had a total square inch cost with no charge for further cutting into the 6" X 2" pieces I needed. A friend has cut me a couple of "tile" pieces. I will try them but expect the glass will still work the best. By the way if you grind a lot, especially contour grind you can expect to see a groove of a type form on the glass. It will be time to replace the glass so having a spare is a good thing.