In case you enter a discount code during checkout that doesn't exist or isn't currently active, then you can see the message: “Unable to find a valid discount matching the code entered”.

Please check out Dune's site to be sure that there are available Dune coupons for promotions or Customer Service at that time. In case you are chosen to obtain those available coupons, you may receive your coupon by email, or a mailed catalog or postcard.

To avoid this problem, you should check out carefully Dune promo code before that promo code could be expired, some promo codes are tied to a minimum purchase, a first-time purchase, or tied to geography, and other reasons.

Most Big Discount Events of the year witnessed a vast number of coupons from Dune released. Especially, on federal holidays such as New Year’s Sale, Thanksgiving, Christmas... or on other important days such as Valentine’s Day, Easter, and Father’s Day..., customers also can buy at Dune with numerous coupons.

Once you find available coupon codes and are approved by the Dune official store, you can submit them to us at Coupon Submission. We are not responsible for the reliability of coupons provided by customers.

Let us know via email, our team will confirm with Dune to fix and remove all Promo Codes, Coupon Codes, and Deals that aren't working.