Amazon has a bunch of free Ebooks that you can read on practically any device using the Amazon Kindle App.
First download the Kindle App for you device:
iTunes CLICK HERE
Android Amazon Marketplace CLICK HERE
Android Marketplace CLICK HERE
PC CLICK HERE
Mac CLICK HERE
Blackberry CLICK HERE
Windows 7 Phone CLICK HERE
Now go HERE and find all free books. The list is sorted lowest to highest so all the free books will show up first.
