About Sony Reader Store
From the site:
Reader Store is Sony’s online eBook store: your one-stop shop for great reads at competitive prices — including new releases, bestsellers, mysteries & thrillers, romance novels, literary fiction, free downloads, newspapers, magazines and more.
Reader Store continuously strives to expand its content selection. Through the Publisher Portal, both publishers and independent authors are invited to make their content available at our store via the Publisher Information Form, or self-publishing sites Smashwords and Author Solutions.