This week, Starbucks is offering an iBookstore redemption code for The Night Circus, a $12.99 book from Erin Morgenstern. The book is also being heavily promoted on the front page of the iBookstore.
Update: The "free" book does indeed appear to be an extended sample, not the complete book.
Starbucks noted last month that it would begin offering free "Pick of the Week" redemption codes for "Apps, extended samples of books on the iBookstore, TV shows, and more from iTunes."
Thanks Jared!
Article Link: Starbucks Offering Redemption Codes for Free Book-of-the-Week