Startup Idea : a price comparison app for shoes

so much time, money and effort is wasted in the price comparison process of shoes when you find a pair you like in a store. an app that allows you to input the style/type/brand/model of the shoe, or even take a photo of the shoe, to easily and clearly display a list of prices offered by other stockers online/in store would put an end to this tedious, money-saving process. this could even extend beyond the store setting, as you could input the model of a friends shoe and know exactly where you need to look first to get the best bargain.