How to compare price of product on Amazon, eBay and Walmart?

Sep 28 2017 9:50 AM

Is there any relationship key between different e-commerce sits like Amazon, eBay and Walmart. For example I want to compare price of MI A1 phone on mentioned sites, and each site will have different productid, so what will be common on these sites which will show me the same product. Please help me out if having any idea?