Startup Idea : To compare prices between ecom sites

These days generally we buy a lot of things from a lot of ecom sites . If we want to buy a mobile , i will go to different sites and will check the prices and then will order from one site . This whole process takes time . What i want that we should make something like , i search for one item and then it search from at least 10 good ecom sites and list down the prices for me . May be something like makemytrip.com - If i want to book tickets it shows ticket prices for all airlines . My idea is somewhere same . For example - I go to flipkart.com and i search for one+ phone . It will give me price only for flipkart.com but my idea is have prices from flipkart.com,amaon.com and many other along with these . Thanks !!