As someone who works for a web company that is full of high-demand listing information, we are constantly having to deal with this kind of activity. Any site with dynamic data that is in demand will already have a procedure to deal with the kind of activity you are driving to it, as they have almost certainly dealt with it before.
In our case, we have a network appliance that can detect if you are a scraper based on your traffic, and then serve you a "you've been throttled" page.
In short, your script will be an exercise in futility.
Here is a better solution for your company - contact the source of the data, and offer to purchase a feed from them. Chances our they will be willing to comply to keep you from loading their website with stupid traffic. You will end up having to pay money, but at least your process won't break. You should suggest this to your boss at least.
A side note: your peers will definitely frown on your actions. If I knew a person behind this kind of activity they'd get branded scarlet-letter-style.