Hi everyone, if u have any niche blog, but u want to monitize by amazon try this plugin: Amazon Auto Links.
Amazon Auto Links will be help u ADD any product Amazon, be permanent on ur database or not.
Support Custom Layout, Cloak, and 'something' relation with 'cache'. Very useful i means.
But dont forget, if this plugin help u to get some money in ur Amazon Affliate dashboard. Give a some donation for the plugin-creator.
Gracias ... Happy Blogging All.