Discount or promo codes are normally valid for a short period of time and therefore come with expiry dates. Buyers are therefore advised to look out for expiry dates in order to avoid being disappointed later. Reputable sites will always display the expiry dates of their discount codes. Further, Where promotional codes have expired, responsible sites always ensure that those expired discount codes are marked as expired or better still, delete them completely. This way they avoid or reduce the risk of their visitors becoming disappointed by promo codes that no longer works.
To further improve customer experience, good discount codes sites display their list of merchants with promo codes and special offers as well as the various categories under which offers can be found. This way visitors are able to easily find the promotional codes or offers they need and which work.