As far as I’m aware, this is the most comprehensive list of book promo sites anywhere on the internet. The list was compiled from various online sources, most notably – Rachelle’s Window (go there and thank her! 🙂 she also lists Alexa rankings for the sites) and my own research. As of updating this on April 17th 2016, all the links below are working. Note that I can’t guarantee that the sites themselves are still working, that the forms lead anywhere, or that you will actually get anything for your money.

Majority of these sites advertise books when they’re free, as part of KDP Select or Smashword promo. If you want to promote a paid book, you usually need to pay extra.

Don’t forget you can also promote your tweets and Facebook posts on Twitter and Facebook, though that is known to be not very effective unless you know…