Kleenex boxes. . . you can find "covers" that slip over the cardboard box that can be readily modified according to the OM box design or, if you want to work old school mentalism, simply cover a standard cardboard Kleenex box and let it look exactly for what it is -- a cheap cardboard box with contact paper covering it; this "illusion of innocence" and casual handling will go far when it comes to the act.
There are several different sources for OM type boxes on the market including the OM Box itself via Stevens Magic made by Bill Montana that are quite pretty bits of art. There is the Chameleon Box of Larry Becker's which I personally believe to be superior in operation but it will sit you back a couple of C-notes.
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