Website related to grocery stores. I want to develop a site where I access grocery stores pricing and deals to save consumers money on their grocery store purchases by comparing prices of stores after consumers enter the products they purchase into their "grocery list".

I need someone to help me gain access to these different grocery stores back end to be able to get access to their pricing and deals so they are current and accurate and can be easily compared in one place (my web based platform). Also open to developing this into an app.