Actually you can sell ebook very easily on Seoclerks. There is a section that allows buyers to sell ebook and your book will get notice easily because there are many visitors searching for ebook there I am also writing my own ebook and gonna put it on Seoclerks soon
You can sell your eBook on various online eCommerce websites. Make sure to choose the most authoritative ones and get a paid listing if required, that would get you the best results.