Startup Idea: Product Comparison and Delivery Software

Startup idea to develop a software or website allowing users to compare prices of specific products across major stores. The solution should also offer features like delivery and pickup requests, and QR code or barcode scanning to access the product database.

I am a frequent shopper and I especially love to buy discounted products. Sometimes, I feel bad when I bought something and eventually find out that the same product is available for a cheaper price on another store. I would like to have a software or website that helps compare specific products in various major stores, like grocery items, appliances or fashion items. I will be very satisfied if there is such an option and if I can request for delivery and pickup. I would like to have that database which can be accessible through a QR code or a barcode picture in my device.