Before Amazon's PPC, Amazon promoted and
still promotes books for free in a via the «Customers Who Bought This Item Also Bought...» section, of book sales pages.
Independent authors are experiencing increased sales by including their books in the US Kindle Owners» Lending Library through KDP Select, an option for authors to make money through the lending library and
promote their book for free.
For the last couple of years, some authors have done very well using KDP Select to
promote their books for free for 5 days each quarter.
If you would like a comprehensive list of sites that will
promote your book for free, and a list of websites that you could submit your book to for free reviews, sign up for my email list here.
But there are more ways than ever to
promote your book for free.
Here, you have multiple opportunities to reach readers from all over the world and to
promote your books for free.
And
they promote my books for free!
And I second his praise for Amazon's KDP Program — I went into detail on the advantages in a post recently at Crime Fiction Collective: «Thanks, Amazon, for
Promoting My Books for Free!»
Basically, you pledge not to sell your digital book outside of Amazon for 90 days, and they allow you to
promote your book for free for five of those days.