Great question — answering as the UphillTech team:
Amazon has a an affiliate program . You earn 4-10% of purchases where your referred the buyer. Amazon offers several options for linking to them such as: Product links (image, text, or both) Widgets Banners Mini Store Here is the link for applying . I've used Amazon links to monetize pages that are specifically about a product that is offered on Amazon. For pages not about a product I've found that Google AdSense monitizes my sites better.
Full answer by Stephen Ostermiller: https://webmasters.stackexchange.com/a/81345 (CC BY-SA 3.0).
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