how to display the same item from different affiliate programs

[ath]

This is an example I'd like to do. Lets say I joined affilate programs from Amazon, Buy.com and Barnes and Nobles. I'd like to display a product and also display from each affiliate product details like availability, price, shipping cost, etc.

How can I do this dynamically that is go to each site and retrieve the information I need and display it on my site. I'm sure there are people that know how to do this because it looks like BestWebBuys.com does it.
thanks.

[Chris]

Amazon has web services that allow you to get datafeeds from them.

I don't think that Buy.com and B&N do.

There are premade scripts you can get that work with Amazon.

[GCT13]

If you want to display multiple prices/sites for products, you're probably better off looking into affiliate or co-branding opportunities with PriceGrabber.com, BizRate.com, or NexTag.com... sites like that.

If you use Amazon's Web Services, you're not allowed to list product info from other sites.