For fans of hardcopy: Where do you get books on the road?

There is a beta browser on my PaperWhite e-reader but it is pretty primitive and not something I would want to surf the web with. Mine is a couple of of years old and maybe the newer ones have a more advanced browser.
The Kindle Fire tablets have an adequate browser - name is Silk - and my wife uses hers to surf and visit forums, Facebook, and so forth. It also doubles as an e-reader. I haven't used mine outside so don't know how well it works in sunlight.