Track price drops with Price!pinx
Here's how it works. You drag a Price!pinx bookmarklet to your browser toolbar. Then whenever you visit a product page on any web-based store, you just highlight the price of the item you're interested in and hit the bookmarklet. The Price!pinx page will pop up and if you enter your email address the service will send you a message as soon as the price changes.
You can also register for a free account to manage all of your notifications in one place. But there's no registration required to set up a basic alert.
[via Techie Buzz]