I bought two of the insulated Muppets sippy cups at my Walmart a couple of weeks ago. Wanting more, I went back to my WalMart where they had them and they were all gone. Weird because they had a good amount in stock. I headed to the clearance section to see if they went there, but no such luck. I read the other entries and decided to check my Walgreens tonight. I was SO HAPPY to see that they had them!!! They even had an Animal one that I hadn't seen before.
I bought the other Muppets 2 pack sippy cups and my two year old could not get any milk out of it. I don't recommend buying them. My sister bought them for my niece and had problems with them as well.
Was going to attach a photo I took of them, but can't. Hmmmm.......