You can pull product data from Amazon without affiliate api
Product Puller is a plugin that helps you pull product data from the internet. Currently able to fetch data from Amazon. You do not need affiliate api for use this plugin.
Features
Allows you to add your Associate ID to links.
You can pull the data from all amazon sites.
You can fetch the product data from Amazon to WooCommerce (with Subscribe option)
You can create custom product comparisons or pull the ready one from Amazon. (with Subscribe option)
You can add the product details to your posts in many ways.
You can translate the plugin according to your language.