Check this page out for proper plug type then pick-up from any Radio Shack store or order online from Amazon.com or other online relectronics retailer.
http://www.kropla.com/electric2.htm
You have to calculate how much wattage your device uses and get an appropriate sized step-down converter. There are cellphone chargers and other electronic power adapters that can be plugged in to any 110–220 volt outlet. Just be sure that the power ratings are well covered to avoid damage to your electrical device.