Textbook Buyback Comparison Website

I need to have a website built that will allow users to input the ISBN numbers of textbooks, and then have an API list populated with the amount that various websites would be willing to pay for that book. I would be an affiliate of each of these websites and would get a commission. You would need to build the site to hook up with these websites, get the amount from them that they are willing to pay for the book, and display it on a "results" page. Then have each price be a link to the website that is willing to pay that amount. The results would need to be sorted from the highest offer to the lowest offer.