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I have something similar to what you want. It's a block of wood with grooves cut in for the various widths of card. You just score the card with an embossing tool or bone folder to give a nice, neat line for folding. I know there are a few similar things on the market in the UK so I'm sure there must be something like this in the US. Have you tried your local craft shops?
If you can't find anything just PM me and I can get you the link for a shopping TV website here that sells them.
HTH
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