I may have an unhealthy obsession with Adam P. McIver's Coin Age. First I came up with some 3D printed coins, because using quarters, nickles, pennies and dimes was too confusing for me, and the paper ones weren't available. of course those coins needed a chest to carry them in..And now...pocket case for coin age and the 3D printed coins on pin shape.
you can get that one here.
But if you don't have a 3D printer I'll happily make you one, and I'll even use the cool color changing plastic.