Take the 7-Day Challenge.Offer valid for Canadian residents only. Offer available only for Kobo eReader device purchases on ca.kobobooks.com between May 29, 2018 and July 6, 2018. In order to be eligible, purchasers must use the promo code 7DAYCHALLENGE at checkout. This offer is not valid in conjunction with any other offer or promotion and cannot be used to adjust amount paid on previous purchases. Rakuten Kobo Inc. reserves the right to change or cancel this offer at any time without notice.