Tanga offers this DIY Guitar Pick Punch for $9.99 plus $2.99 for shipping. That's $7 below last month's mention of a similar device and the lowest total price we could find by $2 (outside the price below). It punches standard 351 shape guitar picks up to 0.9mm thick and includes three high-density strips to get you started.
A close price, Frler2014 via eBay offers it for $13.67 with free shipping. Note that shipping may take three to eight weeks.