Amazon Product Advertising Custom Request/Response

I have a web site that is currently using Amazon Product Advertising (AWS) to retrieve the following data by using the UPC of a particular item: Medium Image, Large Image, Description, Sales Rank, etc. What I need: A stand alone program on the web site where I can make custom queries to Amazon Web Services by providing the Amazon ASIN for each item in an excel file. For example, I will visit the custom script on the website: [login to view URL] Then, I will be asked to upload an excel, which will contain about 50 unique Amazon ASIN's, the custom code will access Amazon's database and create a new file, with the following information inserted in each column/row: 1. Lowest Price in New Category 2. Lowest Price in Used Category 3. Lowest Price in Fulfillment New Category 4. Lowest Price in Fulfillment Used Category 5. Sales Rank 6. Medium Image 7. Large Image Please contact me if you have additional questions. I am not looking for a professional design for this custom code, just a simple upload/download page that performs the functions above.