ExtendAzon 2.0 is a simple to use plugin that can be used on new Amazon sites or even dropped into any existing Amazon WP site. It will convert Amazon affiliate links into shopping cart links.
When someone clicks a standard Amazon affiliate link, they are tagged with an affiliate cookie that lasts for 24 hours. Unless the visitor completes a purchase in that time period, the affiliate will not get credit for the sale.
With ExtendAzon shopping cart links, you get to tap into a hidden secret in the Amazon Associates Program Agreement that allows you to extend your affiliate cookie lifespan from 24 hours to a full 90 days! ExtendAzon 2.0 Review