These Learning Curve "First Years Insulated Sippy Cups" are the best cups you are going to find.  They are the only insulated sippy cups that I have found that do not have extra pieces and they do not leak.  The cup and the top are the only two pieces.  I will not even bother with any other kind of sippy cup.  The average price that I have found is between seven and eight dollars for two cups.  They usually have DIsney liscensed characters on the cups such as Cars, Mickey Mouse, Sesame Street, and Disney Princesses.  The cups also have a clear bottom so you can see the liquid on the inside. ...