https://www.cartercoupons.com/store/barnes-and-noble/ Also feel free to check other promo code sites like Retailmenot.com, Groupon.com, Fatwallet.com, Bradsdeals.com, Slickdeals.net etc. which have very large database of working coupons and promo codes. Where to enter Barnes and Noble Coupons & Promo Codes For 2020 simple answer is you can find a box at checkout time to enter code.