Build a website to Scrap data from amazon, best buy and display comparison results.

Most people around the world use the American market for their purchases through pages such as amazon, best buy, target, etc. I want to create a page like trivago, where all the prices of the products that those pages offer are compared. From sneakers, to computers and drones. We need to have alerts of which are the best prices at the moment and redirect to the page where this offer is. I want to be able to create a user easily so that the search is personalized, and that some products can be put on a wish list, when they lower their price we sent them an email to alert them. Daily offers of all the pages, about 10 suggestions, 5 of products related to the searches that the client has had, and other 5 of other random products of the page that are of promotion. Possibly create an application for both systems, ios and android, where the operation is the same, and instead of sending an email with the notification of the low price, you get an alert to the cell. (but this for later) The page has to be as effective as possible, with an easy search engine. Without being very invasive. Like the Amazon page. Even easier: I want a page to help people to buy on this big pages for less... An example. One day you want a camera, a Sony a7s... Then you need to go page per page (Amazon, best buy, bhphotography, etc) looking for the best discount...So, I want a web site who do that job for people, comparing all this pages, and give a link to go there and buy it. Like trivago.