https://www.amazon.com/NEVADA-Poker-Chips-Custom-Black/dp/B0092HOHGA

I've heard that Spinetti's in Las Vegas also had them for sale.

Cat Trac Truck, my Toyota pickup, loves Nevada Club chips. He grabs 'em and rolls them under the seats and to other obscure places where they remain, hidden but rattling, for long periods of time. I know of no other practical use for these brass fakers.