Therefore, in major ebookstores, you may find public domain books that are not free. (ebookfriendly.com)
Top places in the Books category of Apple iTunes App Store are occupied by free apps from major ebookstores, such as Kindle,... (passwordincorrect.com)
The same goes for Barnes & Noble, Apple, and all the other major ebookstores. (epublishyourself.us)