Polyester/Plastic Bowling Balls. We have sorted all the bowling balls available by performance level so you can find with ease the ball you need. Polyester or Plastic balls are usually balls meant to be used for shooting spares, throwing straight or for kids to learn to bowl with. These are the most cost effective bowling balls to buy. No matter what you skill level is you need a polyester ball to complete your arsenal and improve your game. These polyester balls are beautiful and most come in 3 color blends.