[Neko]

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You could do it using scraping technology but that would require constant updates. For example you request site.com?productID=23 and parse through the entire html text for "Our Price: $" and then take all the text that appears after that string. You'd have to write a seperate routine for each site you wanted and any time they changed thier text that your scraping you'd need to update your routine.

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I think that would be very computationally intensive given the huge number of items available. Hopefully many of the sites will have xml feeds I can use.

Thank you both very much for your help. I'll start doing research on this by contacting the sites I have in mind. If anybody else has any experience in this area I'd love to hear about it.