I purchased this cup from Wal-mart the other day and I absolutely love them.  They have a flip top that folds the straw down when not in use.  This not only keeps the straw clean, but also it makes the cup spill proof.  The cup also comes in several fun colors and is shaped so that it easily fits into a toddlers hand.  I have found that you can even put a regular bendy straw in the cup and it works just the same.