I bought a pack of water balloons on clearance for $.50 and Seth has more than gotten our moneys worth out of them. We had a water balloon toss/fight, blown them up and let them go and played keep it up. He also learned how to blow up balloons. One day we blew up a balloon and let it go over and over for about 30 min with one balloon. Seth giggled non-stop the whole time. It was the best half-a-penny I ever spent!