Price Watch keeps track of the price of products sold on Amazon and alerts you with email only when price changes. Amazon Associate ID is acceptable.
Price Watch For Amazon is a WordPress Plugin for tracking items' price from Amazon. It allows user to enter an Amazon detail page url and an email to create a wacth job easily.
This service is provided by NukePrice.com. Amazon.com, Amazon.co.uk, Amazon.ca, Amazon.de, Amazon.co.jp, Amazon.fr are all supported. Just paste the Amazon detail page url and your email address in, and click 'Watch This Item'. If you see the detail page, a watch job is created. You will receive an email ONLY if the price drops or Amazon start offering the item IN 30 DAYS.