Custom Price Engine

Need a provider that can create the following. Please only bid if you can deliver everything that is stated. Thank You. Need a full functioning site that monitors prices for SPECIFIC products. For example if I wanted to monitor the price of Apple iPad, I would want a site where in the back end, I can enter all links from the merchants, (Amazon, Newegg, etc.) and the front end of the website would monitor the prices in REAL TIME and show the lowest available price. Should also have an email alert function when prices change for website visitors. More details will be given via PMB.