Coin Holder Screws — Where To Buy?

I have been experimenting with making my own "Capital Plastics"-style coin holders, using a laser cutter. But the problem I am having is how to fix the layers together.

Taping the edges with metallic washi tape looks good and holds well, but makes adding or replacing a coin very difficult. Also, removing and re applying the tape tends to spread the adhesive around, and then the holders pick up dust and look untidy.



I tried something with magnets that I thought was really clever, but I have yet to get it to work quite right. So it's back to the paired screws Capital Plastics used. I've managed to get a few to experiment with by cannibalizing old holders, but where can I buy a box of 100?

The thing with magnets involved cutting holes at the corners of the cover plates, just a little larger than the diameter of some rare-earth magnets that I bought, then putting some two-part epoxy in those holes, and pressing the magnets in. The idea was that the epoxy would fill the gap between magnet and acrylic, harden, and bond to the plastic, holding the magnets firmly in place. Then the magnets would attract each other through the center layer, holding the covers on. Unfortunately it didn't really harden or bond to the desired extent. I've come to think that casting resin would work better.