It's tough to beat RetailMeNot.com when it comes to the number of coupon codes and offers the site has. It provides 500,000 offers from more than 50,000 retailers and brands. It also provides exclusive codes through partnerships with retailers on a weekly basis. Its free mobile app will notify you when there are offers at nearby malls, stores and restaurants (if you let it track your location, that is). Another great coupon site and app with a wide selection of printable coupons and online promo codes is CouponSherpa.com.
I do not like the security of this apps. By default any one in my home can just open it up and start buying things on my account. I would like it to just add things to my cart on the TV and them buy on "My" Computer or "My" phone. I know you can setup a PIN for "videos, purchasing and certain types of content".But, you then need to enter the PIN for $0 videos. Also, anybody with access to the Fire TV remote can just install the apps and start buying things, no pin, no password, just because you have a Fire TV setup on your account. Amazon you need to have a separate PIN for Buying videos, parental control (ratings), Apps and Shopping. And by default the app should setup a PIN.