https/www.google.com/search?q=10v+dc+500ma+power+supply&ie=utf-8&oe=utf-8&client=firefox-b
You will want one with the same connector as the original power supply. Worse case you could just cut the wire of the old power supply and splice the connector to the new power supply.
If you find a power supply that has more than 500ma that is fine but not higher than 10v in voltage.
https/www.google.com/search?q=10v+dc+500ma+power+supply&ie=utf-8&oe=utf-8&client=firefox-b
You will want one with the same connector as the original power supply. Worse case you could just cut the wire of the old power supply and splice the connector to the new power supply.
If you find a power supply that has more than 500ma that is fine but not higher than 10v in voltage.