Commercial RSS Feeds

[papamaku]

I know that Amazon has RSS feeds of its main categories, and CNET has feeds of some products + reviews.

But are there any other big e-commerce or commercial stores/sites that have feeds of their products?

Also, any chance of any of the price comparison sites offering public feeds? And why doesn't Ebay have an RSS feed for each category? I'm sure its possible through their developer program, but why not just have public feeds?