I am doing a science fair experiment testing the effectiveness of polymers commonly used in football helmets. I am planning on using polycarbonate and ABS, because they are commonly used. However, I am looking for one or two other polymers that are similar in strength and price to add more of a variable. I have done my research, but the only other polymer I have found is Noryl, which is a little out of my price range. Does anyone know of any materials like this? I also need something that can be bought in fairly small quantities.