Go to: www.couponcabin.com
The site has hundreds of retailer coupon code listings (brick and mortar stores as well as online retailers). When you sign up, the site allows you to choose which stores you would like notifications for. When a new coupon code for your chosen stores is available, it will email you the codes.
I just bought a book on Barnes & Noble. The book retailed for $16.00 and I bought it brand new for $8.07 shipped to my door! Can’t beat that!