Someone else mentioned they keep them in the box that the 13th Bee's came in so that's where I keep mine.
I have a large stack in a Circus Punks box...I put the cards in their respective bags and store them in the box which in turn is inside a large rubbermaid conatiner to keep them clean and fresh..
hey shibby, is that a ninja pikachu? hehehe he's cute and dare i say it might be a... Naruto ninja pikachu???