Use coupon code BOOKSMARTS for 20% off your entire online purchase at HPB.com from 12:01 AM 7/17/2017 - 11:59 PM 7/25/2017 CDT. Limit one coupon per account. Not valid during sales or in combination with any other discount or coupon. No adjustments made to prior purchases. Cannot be used on single items priced at $300 or more, pretax. Cannot be used to purchase gift cards. Not valid at Half Price Books retail stores or Half Price Books Outlet locations.