Offer valid online only through September 17, 2026, at 11:59pm ET, or while supplies last, for customers age 18 or older in the United States. To receive 15% off eligible purchases, enter promo code FALL26 at checkout. Excludes digital products and pre-orders. Discount cannot be redeemed for cash, combined with any other discount offer, or applied toward the $35 minimum purchase requirement for free shipping. Free standard ground shipping is available on eligible non-rush orders of $35 or more within the 48 continental United States and to FPO/APO addresses; excludes Alaska, Hawaii, U.S. Territories, rush orders, and expedited shipping methods. HarperCollins reserves the right to deactivate the promo code in the event of fraud or technical issues and to limit quantities of individual items eligible for purchase with this discount. Not valid for resale. Void where prohibited, taxed, or restricted by law.