Jason Houk, one of the beta testers mentioned a specific one he used with his during beta test. It was made by Anker. Private Message him for more info, as the thread he posted in very long...
Look for chargers that are fit for Apple iPads - they typically supply 2.1-2.4 amps out of each port. I own several Anker chargers as well as Amazon's AmazonBasics branded chargers and all work well.