I would think any DC-to-DC Cigarette Lighter/Power Port adapter with a selectable output option of 9 volts at around 1.5 Amps would work. Interchangeable plugs would probably be good too, since the tablet uses the small plug for power input. Radio Shack used to sell one, Coby makes one. I'm sure a little Google searching would find you what you're looking for.
let me know if you find one i bought one on ebay it was too big, and no a google search doesnt help too much i have searched other forums and found no help so i gave up lol the official response from merimobile any usb charger should work...the morons didnt even know it doesnt charge via usb.