After looking high and low for a week for a local source of Coroplast I found some at a local Menards store. It was called Durotherm and was in the wall section. This was AFTER I wasted $30 trying to tape togeather a bunch of 12x18 pieces because I couldnt find a nice 4"x8" piece. I have also seen it called twin wall plastic. Trust me, it gets annoying to try and explain what Coroplast is to the 5th employee you have been passed off to because no one has a clue what you are talking about. Now I can finish my cage YAY.