Does anyone know where i can buy the soft spout refills for the Nuby cups.

THey look like the last pictures on this page:


I have been buying the cups from the Eugene club but they do not have the refill spouts and its the only soft spout i can find that my son will drink from. So we now have over 10 cup as they middle of the spout breaks after a while, and i don't want to buy more cups! just refills!