Convert ASIN into UPC

I need someone who can write a script in Ruby that can automatically query this site: [login to view URL] . It's actually not a query but have to simulate the usage of the webpage by inserting a ASIN number and saving the resulting number (try it yourself using B0051T9MK4). The script should be delayed so it doesn't cause inconvenience to the owner but it will probably have to query around 50.000 different numbers. I can provide a CSV with all the data to be consulted and the results of the script should be delivered in CSV format as well. I will do the payment after a small test of the script is done, with no down payment. It's a simple script reason why it shouldn't take long Any other solution to convert ASIN to UPC is accepted as this is the real only way I found to do so. Payment for the script will be done after an initial test