No one likes paying retail and I'm always looking for ways to save. RetailMeNot has both a US and Canadian site. Its sole purpose in life is to provide money saving coupons for online sites you already use.

You go to the site and search for the retailer you are about to conduct a transaction with:

Most of the time, you will be presented with a series of discounts for each retailer, you select the promo that looks the most attractive and click on the Show Coupon Code. The site opens the retailer in a new browser window and displays the discount code:

The voting allows users to confirm the validity of a deal and the description provides the condition of the offer. Typically they display the hottest most popular deals on their homepage.