I have looked every where for them and I know they are in high demand but where can you get them?

This year for Christmas my baby brother wanted a Zhu Zhu Pet so I was gonna go out and buy him one but then I saw this article on how to find one and I guess I never realized how popular those are! What got them so popular?

I went to Walmart’s wed site and it said that they had them but when I got there was nun! That why I want yall to go to the store. Thank You