The place is called Plasticare and they have it all. You could do layers of thick matt over the top of each other. The biggest problem is shaping it, you could use some bend sheet metal or create a mold of wood or ?????
The place is located across the street of Red and Jerry's at the south end of the strip mall and the west side of the 'SHOPPING" area. They have a great selection was there last Tuesday. Good luck!