Best "cheap" tablet PC for Ignition

Thanks, I am looking for a portable, light weight touchscreen PC to walk around with and launch clients (gateway is running on another PC). I know there are issues with Android and other operating system that don’t support J2SE, unless you use the mobile module. This is not something that will be used in normal production, just for me to teach the locations of a storage retrieval machine without carrying my laptop around. Also something that runs for a long time on a charge would be useful.