http://www.jpscorner.com/2x2_Holders.htm

I use the (2 1/2 x 2 1/2) with a 1 3/4 window, it gives me room to write on them. They fit in the 12 Pocket Pages for regulatr binders. I keep all my Chipco's in these, they have mylar windows that help keep them from bleeding.

jpscorner.com also has a bunch of item for Casino Chips and Tokens.
http://www.jpscorner.com/Casino_Collecting_Accessories.htm