Very simple, I know exactly why, although slightly relunctant to share it with you. It's done by hand
Ha, yes, more then likely, actually I was refering to the ones where you see 'aff.' or '-aff' at the end of the add.. that's not ebay/amazon itself, that's an affiliate of those companies through cj.com
Basically, someone types in 'britney spears new cd', they see a link to buy it for $13.49 (good price if you ask me), or preorder it, or whatever... They click on it, charges the ad-runner 5cents, then they buy the cd, and make $2 on Amazon's 15% commisions. That's why you'll see ads for Amazon on almost anything they sell, simply because there are a ton of freelancers doing this. It's not easy, and it's not simple, but it can be done. 
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