I find that trying to use cereal or shirt boxes they just aren't big enough, and in my experience that cardboard is also a little bit too thin. I found the cardboard I was using was about .060 thick. Also, it helps quite a bit when it is white.
After being disappointed on line, I finally found what I was looking for at a Michael's craft store (I guess they are somewhat of a chain). It was called "Mat Paper" and used for framing pictures. Nice white, .060 cardboard in large 38*28 pieces.
As usual though it was expensive, I think $6 a piece. But it just works so much better than anything else. I have not looked online yet for "Mat paper" but looking online for chipboard was a bust for what I wanted.
Besides, the employees and customers at the craft store were a pleasant surprise, if you like that kind of nerdy arty cute library glasses type.
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