"Another alternative to publishing on Amazon is Portland, Ore.-based BookBaby, which has a $99 "self-publishing made easy" option which formats e-books, offers cover design, and has a better-known sister company called CD Baby that sells independent music. It distributes its books to the iBookstore, Amazon, Kobo, Barnes & Noble's Nook, Sony Reader and others."The article (linked below) also mentions Smashwords.com. But there is also Lulu.com and others (Booktango.com) to look into.
Read more of the article: Can E-Books Succeed Without Amazon