This is a picture of the number one [best sippy cup] for Nuby.  It comes in a variety of bright colors as you can see below.  It is not expensive and can be found at most Walmart stores. 

If you don't have a Walmart store near you, you can order these on Ebay along with the Nuby sippy cup replacement spouts for a very reasonable price.  Here is the link : 

http://stores.ebay.com/Only-the-Best-Baby-Products-For-You

Nuby sippy cups BPA Free

One of the [best sippy cups] in the world is the Nuby 10 oz sippy cup which is bisphenol A free (BPA free), spill proof and leak proof.

These cups are the number one best seller for Luv n Care, the company that owns Nuby brand.  

Babies and Toddlers love the Nuby sippy cups because they are easy to grip.  They are also the [best sippy cups] for babies transitioning from bottle to sippy cup because they have a very soft silicone spout.   Other sippy cups say they have a soft spout but it isn't as pliable as the Nuby sippy cup spout.



Nuby Sippy Cup + Nuby Replacement Spouts