Our local public library starting using Mymediamall.net you use your local library card to sign in. I don't know how many people are aware of it. You will need Adobe digital editions to use it. They have member libraries all over the United States so you may want to check to see if yours is a member. Not a huge selection here, but it is getting better.
http://www.mymediamall.net/106868D8-...en/Default.htm