I would say that most online stores use some form of coupon redemption by the use of codes. Just like a regular coupon you would give at a store, you use a coupon to get some kind of discount. When buying ANY product online, I would highly suggest to search for coupon codes for that specific website before purchasing. Here is a site that keeps track of a lot of coupon codes for most every online store worth mentioning. The site is called RetailMeNot. Just go there and search for the site you're buying from. A few weeks ago, I was able to find a 50% off coupon for something I was buying. That's a HUGE discount!
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