Thanks to lifehacker, I've just learned that there's a Firefox extension called PriceDrop that will track the prices of various Amazon products for you. Best of all, it will notify you with a pop-up window whenever the price drops, so you can quickly pull out your credit card. Price drop will also help you get a refund from Amazon if a product you've already bought becomes cheaper. Don't worry, there's no third party sketchy software installed with PriceDrop.
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