11. Suncoast Credit Union Suncoast Credit Union has self-service coin-counting machines in each branch lobby, but while they’re cheaper than machines in retail stores, they’re not free.

Kansas State University Technology Development Institute is helping a Kansas entrepreneur design a machine that produces custom coins.

Coin karaoke works like a vending machine, where one can begin by inserting coins or paper money. Coin-operated karaoke machines are exploding in popularity in South Korea.