For most indies, book marketing and promotion is an essential part of our business plan – almost as important than the writing itself.  Bearing that in mind, I thought it was important to have a list of sites that could be used for marketing/promotion purposes.
1) Bmi Books:   Starting from $10 onetime fee
2) OltoApp: (Free and Paid)    
3) Olto Recommended Books:  wait some time for approval – Once approved you will get an email
4) Books WiFi:
5) WordLikes: – is a site that generates interest for books not only through their email list of over          410,000 subscribers but also through a huge network of blogs.
6) Best Reads(Free & Paid Featured books):