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I know that Amazon shows ads from AdWords since they are considered part of the Google AdWords Search Network (not the Display Network). I haven't used AdWords to advertise on Amazon since late 2011, but I just checked out a Amazon product page and checked out the Sponsored Links. The URLs are being sent through A9.com, but the landing page had the "gclid" parameter appended to the end of the URL which leads me to believe that these are AdWords ads. I had a lot of success advertising on Amazon product pages by offering the product cheaper than Amazon did and including the price in the copy of the ad. For example, a ping pong table was on Amazon for $300 and so I created an ad for the exact same ping pong table and listed it for $279. Even though my site did not have the reputation/credibility of Amazon, shoppers were more than willing to click on the ad to visit a third party site for a better deal. Anyways, that didn't really answer your question, so if you want your ads to show up on Amazon under the Sponsored Links, I suggest setting up an AdWords account and choose the Search Network.