This post is going to be updated later when I have more time.
Let's start with the easiest method, where you can find the Top 100 Free Kindle Books in any category.
Step One - open your AMAZON.COM account and login.
If it doesn't say AMAZON PRIME, than you won't get access to all the free books.
[It's only $70 per year (or something like that) - I'll correct later] - so, it's worth it!
Step Two - go to the Kindle >>> Kindle Books
Step Three - under Browse, and under Popular Features select Bestsellers.
Your Top 100 Free Bestsellers are on the right hand side. Wanna drill down into a specific category - choose from the genres on the left, find Bestsellers again and you'll have your list again.
Just download at will - remember, you're storage on the Kindle is never a problem since it's all stored IN THE CLOUD!
If that helped you - tell a friend.