I am making new signs for tennis court nets. They are attached to the nets near the sides. I have used 3MM WHITE EPS UNMASKED EXPANDED PVC with a laminated vinyl sticker (2' x 2' round). The problem is that the players evidently think it's fun to tag the signs while playing and they break (the signs, not the players ;-)) on impact. Is there a sturdier material out there that doesn't cost an arm and a leg and that can easily be cut round? My closest supply center is in Vegas. The courts are outside.