Sells Like Hot Cakes - Reverse ASIN Search Tool

This is a great Amazon bonus tool inspired by the well-known "Keyword Inspector" which allows you to legally spy on your competitors and search for the top converting keywords for best-selling products in your category! No extra purchase of credits is necessary. All searches are free! (Included in your membership as a bonus). You will be able to check the rankings of the specific keywords by searching using the ASIN number. Both Amazon US and UK are supported!
Source
Reverse Search For ASIN*
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ASIN must be searchable on Amazon. If parent ASIN is not searchable try varation (child) ASIN instead. The product must have high rankings to return many keyword results.