Just went and bought supplies for my c & C cage. I was able to find grids that are 14x14. I set it up in a square using 8 of them. A real nice roomy area. I also bought a flying saucer wheel, 12 in from Petsmart. Here is my problem. I cannot yet find Coroplast. Is there something else I could use for the bottom and up a few inches on the side instead of that? Any suggestions would be appreciate. I am trying to improvise with any suggestions. Even if I can buy the Coroplast I would need a 41"x41" sheet to make sure that the inside would go up approx 5 1/2"-6" on all sides. Are we talking really expensive here?