Firefox: Sure it's fun to hunt for deals online, but it's even better to be alerted when an item you want is at its lowest price. Ookong is an Amazon.com price comparison tool you can use to track price histories.
You can use Ookong as a stand-alone website, but it's not as convenient as using the Firefox extension. Once you install the Firefox extension every item on Amazon will have a "Follow" button, as seen in the screenshot above. When browsing you can click the follow button to add the item — as we did with the game Dominion — and it's added to your watch list. You can click on the item in your watch list to see the price history, seen below:
You can tweak the Ookong options to specify when you want price drop alerts. You can specify a dollar amount, a percentage, and how many times you'll be alerted to the price drop before Ookong stops notifying you. If you frequently shop at Amazon, Ookong is invaluable for keeping an eye on prices. If you keep a wish list at Amazon the first thing you should do after installing Ookong is to go and "follow" all your wish list items to keep an eye on falling prices.
Ookong can be used as a stand-alone web-based tool or integrated into Firefox. Have a tool for finding the best price online, Amazon-related or otherwise? Let's hear about it in the comments.