New egg Auto Buy Script Needed

I'm looking for someone to create an auto-buy script for New Egg Open Box items. Ideally, I would like to be able to enter any URL for an open box item (The URL never changes regardless if the item is available or out of stock) have it continually monitor the page and when the add to cart option becomes availabe, automatically buy it with a credit card and then terminate the script once the item is purchased.