Before you invest in a 'cheap' inexpensive tablet, check out the battery life. You probably need it to last at least 6 hours between charges. Many of the 'cheap' tablets lasted only 3 hours.
Some tablets/phones do not support USB file systems. For example, the Nexus line does not, due to a dumb decision made at Google. The manufacturer does not include the code needed. The 'Chinese' tablets generally support USB OTG.
Not sure if this is relevant, but there is a problem while reading Android files from a PC. If the USB connection is using MTP, you may not see newly created files or directories. Refreshing the Android MediaManager does not seem to help, restarting the Android always works.
