As a niche site builder, you should consider building out a genuine authority site…one that goes beyond the Amazon Associates program as a singular monetization method. Authority sites can net you a much higher ROI, typically have diversified traffic and revenue streams, and thus can protect against changes in any one program better than a niche site that only earns revenue from Amazon Associates.
The Program Operator, and its associated companies may, in good faith, modify any of this agreement and/or the Terms and Conditions (including the affiliate Commission Schedule), at any time and at its sole discretion, by posting a change notice or a new agreement on the website. These changes will come into force immediately upon posting. The affiliate’s continued participation in the affiliate program following the said posting of a change notice or new agreement shall constitute binding acceptance by the affiliate of the change.
Additionally, you must either include the following disclaimer adjacent to the pricing or availability information or provide it via a hyperlink, pop-up box, scripted pop-up, or other similar method: "Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product." In the above examples, "Details" and "More info" would provide a method for the end user to read the disclaimer.