We Give Books site. This is a great site for e-books and is FREE! They are good titles too, including books like Stand Tall Molly Lou Melon, Llama Llama Misses Mama, DK Explorer, DK Vikings, Human Body Q&A, and more. There are not really any chapter books I have seen, but lots of picture books and non-fiction books for elementary ages mostly. With over 200 e-books and all free it is a fantastic resource in itself, but there is an added bonus. The site says "Simply choose the charity you want to read for and then select the books you want to read. For each book you read online, we donate a book to a leading literacy group on your behalf." It doesn't get much better than free books that give free books when you read them! Check out We Give Books soon and use it with a whole class, on your own, with a small group, or as a center.
Any other great resources for e-books out there?
Edited to add: Here is a link to my ongoing livebinder collection for e-books.