McGraw-Hill promo codes can be found on large discount websites, such as DontPayFull.com and GoodSearch.com. The company does not directly offer codes on its own website as of September 2015, but it does offer savings through seasonal sales and a clearouts tab offering discounts of up to 80 percent.
McGraw-Hill is a massive company that provides services in the education, financial and professional development fields. All of these are separate for promotional code purposes; a code for a site-wide discount may work for educational products but not professional ones or vice versa. Offers on discount sites may expire or be limited in scope, so they may not always work. Discount sites also link to the promotions that McGraw-Hill offers on its home page. These links provide no additional savings.