Today only (12/30), Amazon has a wide selection of Top Authors of 2016 Kindle books on sale for up to 80% off ($3.99 or less). Deals include books by David Baldacci, James Patterson, Michael Connelly, Nicolas Sparks, and more.
You don't need to have an actual Kindle to read the FREE Kindle books (although the price has dropped to only $39.99 for the cheapest Kindle Reader). You can read Kindle books on your computer, iPhone, iPad, and more.
Between the FREE books from Amazon and Kindle books I've checked out from the library, I've been having so much fun reading on my iPad. I really thought I wouldn't like not having a physical book, but I love it.
If you're interested in additional Kindle freebies, you can check out the current FREE Kindle books.