book discounts: blogs
2 blogs in the directory cover this.
Book Cheapskate
I publish a daily, hand-picked list of great Kindle books available free at Amazon. Don't sleep on these books, they might go back to full price tomorrow!
Spicy Ebooks
5 authors, over 100 books, all the heat
Machine-readable: this list of feeds, as JSON · their recent posts, as JSON Feed · all topics