What? I first do research on what specific model I gonna buy and than check who has it the cheapest with a minimum good Shoprating. Often enough I can buy it f

What? I first do research on what specific model I gonna buy and than check who has it the cheapest with a minimum good Shoprating. Often enough I can buy it from or through Amazon. How do you use Amazon that you will get different quality of a product in comparison to shopping somewhere else?