I’m pretty sure in the US you can make your own paper currency but you cannot mint your own coins.BerkShares | Currency of the Berkshires Region
berkshares.org
So they are essentially local purchase tokens that cost a business 1.5% to convert back to currency.
When using them you are purchasing an item that participating businesses have agreed to exchange at a predetermined rate for other goods - they are not currency.
The question is if you would be charged for printing your own
I’m just wondering who’s face would be on the NES 100