Y'know, there're a zillion Chop Cups on the market......I only own one.....this one. I dinged it one-half star, because the gimmick in the cup is small and dead center, so you have to make certain the ball "sets" before turning the cup over.
I purchased mine via magictrickstore.com ...... reasonable price and comes with a standard ball and a gimmicked ball. For the money, an excellent purchase in my opinion.