Time to Start a Nickel Collection

The Nickel (5 cent piece) is now worth 7.5 cents. This being the case, if you exchanged paper money for rolls of nickels, you would have an immediate 25% return on your investments (assuming commodity prices stay the same). I see an arbitrage opportunity here, but I don't know how to melt down nickels or find people to purchase them. If anyone out there deals in copper and nickel, let me know.