Here’s a new service that will let you set up a price-change watch for an item on Amazon. You can monitor the changes in an aggregator such as Bloglines.

This simple and handy service allows you to passively watch single Amazon products and entire wishlists in your newsreader….Next time a price change is happening for one of your watched items, be it new price or used price or both (you decide), your newsreader will tell you about it.