The exact quote says:
Dear Customers,
Today we're announcing a new benefit for Kindle owners with an Amazon Prime membership: theKindle Owners’ Lending Library.
Kindle owners can now choose from thousands of books to borrow for free, including over 100 current and former New York Times Bestsellers — as frequently as a book a month, with no due dates.
Not without a big fat hornet in the ointment of course: you should be a client with the Prime membership. What, in turn, means that you'd be better the US resident as only there you can benefit most of Prime.
Well, even if not absolutely free, it's a small step for a man and a big one for the Internet giant.
