Plenty of top affiliates earn a decent amount of money from promoting Amazon products. It is easy to link to Amazon products and simply forget whether they are in stock months later. The Azon Links Checker plugin is a handy script that checks your affiliate links to detect products that are not in stock.
This plugin simply scans your entire site for Amazon affiliate products. It finds links to products that are no longer sold on Amazon. Its checks can be done daily, weekly, or monthly. Webmasters get an e-mail if the plugin detects any problems.