Saw this on reddit

http://www.joinhoney.com/

Q. What is Honey?
A. Honey is a browser plugin that makes sure you are getting the best possible deal when you shop online. It places a non-intrusive "Find savings" button in the checkout page at hundreds of online shops. Simply click this button and Honey will automatically find and apply the coupons for you.
Q. How does it work?
A. Honey constantly monitors the web for new promotions and coupon codes. When you click the "Find savings" button, Honey checks coupons that have worked for other people.
Q. What browsers do you support?
A. Honey currently works on Chrome and Firefox. Support for other browsers is coming soon. To vote for your favorite and add your name to the waiting list, click here.
Q. Do I need to register an account?
A. No, you don't need to register to use Honey.