Ok, this may sound strange, but go to any store and look in the dog toy section. (I got mine at WalMart) I got a really nice soft thick rope for my son to play the game tug-of-war. It has about 4 or 5 big knots in it for good gripping. My son loves to play this game with us. I bet your kids would enjoy it too. The ropes I saw even came in neat multi colors. This was actually a recommendation to do with my son by his OT. But, you can do this with a towel, or a sheet or whatever you have around your house.