Hey,
I have made exactly that kind of automated script for personal use. I do it to fetch competitor prices and then increase my price accordingly. What HTTP methods do the URL's use? If it is across different websites, does the script have to identify the price from the source code and then use it? If so, my script can already do that.
Even better, it copies the title and changes it slightly to improve SEO of my Ecommerce website.
This is perfect, because if i change my bot a little, it will be good for your use! :)
By the way, what language do you need the bot in?
Cheers,
Abhinav