Prixfeed lets you create an RSS 2.0 feed for an Amazon.com product price, so you can get track price changes and buy when the price is right for you.

To get the feed, enter the Amazon product page URL, or the ASIN/ISBN code:
   
(for example, to get a feed for the book "Makers" you can either enter its Amazon ASIN code: 0596101880 - or just the product's Amazon page URL: http://www.amazon.com/o/ASIN/0596101880/)




You can easily create feeds with the Prixfeed bookmarklet - drag this link: prixfeed to your bookmarks, and click it when you are on an Amazon product page you'd like to track.