It's "prop money". Print out on cards and cut out. Various denominations.
Copper - 1, 5, 10, 50, 100.
Silver - 1, 5, 10, 50, 100.
Gold - 1, 5, 10, 50, 100, 1,000, 10,000.
Platinum - 1, 5, 10, 50, 100, 1,000, 10,000.
Each type illustrated, of course. Will be in two sizes ("deluxe" 5.25 x 2.25, 6 per page, and a "budget" version 3.5 x 1.5, 12 per page) (all in the ZIP package). Coloured and b/w versions of each, also (coloured versions shaded according to the coin metal type, b/w versions you either print as-is or print on coloured card of your choice).