I've also used boxes from U-line that are used to mail/store business cards. They are heavy gauge cardboard, inexpensive and hold about 200+ cards per box. They make a longer box that is more like the boxes at the casinos but I found the shorter boxes easier to use. They store easier in a bookshelf and are easier to go through the cards inside. More expensive or rarer cards I store in 3-ring binders the business card pages like everyone else.