Amazon has added all seven Harry Potter eBooks to the Kindle Lending Library today, negotiating an “exclusive license” with Pottermore.

J.K. Rowling‘s major bestseller will join more than 145,000 books that Amazon Prime members can check out for free (a service without due dates). The books now available at this link.

Amazon CEO Jeff Bezos did the math for Amazon users: “Over a year, borrowing the Harry Potter books, plus a handful of additional titles, can alone be worth more than the $79 cost of Prime or a Kindle. The Kindle Owners’ Lending Library also has an innovative feature that’s of great benefit for popular titles like Harry Potter – unlimited supply of each title – you never get put on a waiting list.”