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).