Amazon product information to MySQL database

Hi Please can you give me a price to develop some PHP to download product information from Amazon for products we are selling and write it to a MySQL database. I want a PHP script that can be run from a cron job to maintain a MySQL table containing all the products we are selling on multiple Marketplaces. For each product I would like to store the information returned by GetMatchingProductForId and any other product information that we can get. We sell items with parent child relationships and we want information on the parents and children, I would also like information on child items that we are not selling. The second table should contain the pricing information for each marketplace/product/condition/fulfilment channel/seller so that I can determine whether we have the BuyBox and if not what the lowest price is. We sell some ASINs through both MFN and AFN so we will have more than one SKU for one ASIN. We are currently only selling on Amazon UK but hope to add other European sites in the future. I am using a Linux server with PHP 5.3 and MySQL 5.1. If you have any questions please ask, I am also open to your ideas and suggestions. I write some PHP myself so I would like commented code to help me understand how it works and we would expect to own the copyright to the code.