Sale is valid only in the US for select eBooks on this page. Sale runs from December 19, 2019 at 12:00 AM EST through January 1, 2020 at 11:59 PM EST. The page of discounted eBooks is subject to change at any time without notice, and eBooks may be removed from, or added to the page at any time during the sale period. This offer is not valid in conjunction with any other offer or promotion and cannot be used to adjust amount paid on previous purchases. Discounts cannot be applied, nor the discount value refunded once a purchase is complete. Rakuten Kobo Inc. reserves the right to change or cancel this offer at any time without notice.