iphone app

I hired somebody to do an iPhone app, they could not produce. Sparsh Communications is not allowed to bid. I want to create an application that can scan a textbook and tell you what it is selling for on amazon and half. You then have an ability to go onto the next page and see what it is selling for on amazon AND half. You can click "sell now" to take you to the page that will list the book. the "sell now" link that it should take you to is different than your isbn number, I can give you a database to show you where to peel the ASIN. I have the source code needed to get you started. I am looking to spend only 100-400 more dollars on it.