Each offer has a limited duration that expires at the specified time. Some online promotions may require that you enter a code upon checkout to redeem the discount. All sales and promotions exclude course materials, gift cards, graduation gear, art and school supplies, technology supplies, Apple products, and all clearance items. Promotions cannot be combined with any additional offers or discounts, and will only apply to a single transaction. Discounts can only be applied to in-stock items.