Kindle or Nook... I'd look into the older ones that have the old school e-ink. They are very easy on the eyes and work great outside. The build quality is (IMO) a little better than the newer LCD-style ones. Put on a basic little case and it will survive everyday type falls and bounces. They are only $70 new from Amazon, but I'd check craigslist for the older ones, personally..

~amy