http://www.squidoo.com/kindle-and-nook-books-for-kids
Lists Kindle and Nook free and 99 cent kids books.
If you want to add yours, please visit the site and leave a comment in the guest book.

A google search of nook books kids has this page appear on the first search page.

I had written a story, plus i was coming up with free and cheap books for our daughter to get started with. I just figured I'd share & now give writers another place to post their book.

The one for teens and above is
http://www.squidoo.com/kindle-and-no...-only-99-cents
the only requirements is that they are appropriate for 13 and up
the site had a G rating through Squidoo.