Have you checked out Google Play yet? It’s an ebook store, a companion to Google Books. It’s not brand new, but has recently been gaining titles. Google Books is the site that lists books, lets you look at samples, leave reviews, and get more information about each book. Google Play is the place where you can buy the ebooks. I have several of my titles listed there now, and I’ll be adding more soon: https://play.google.com/store/books/author?id=David+Sloma