First, please double check that the promotion you are attempting to use is not expired.

Second, make sure that you click Update Subtotal after entering your code. If you do not see promotional prices when you View Cart, you will not see them after clicking Procees To Checkout.

Many promotional codes will not work with other Discgear.com promotions, such as, Free Shipping.  You may use your code, but this may negate other online promotions.