Amazon has a policy that if you buy something from them, and the price drops within 30 days, they will refund you the difference.
The Amazon Price Watch tool makes tracking potential price drops easy.
Simply enter the product number in their online form. Their bot then checks Amazon every day and emails you if the price falls.
The email also contains a link to the Returns and Refunds Contact Form you need to submit to get the money. Hot! — BEN POPKEN
Become an Amazon.com Price Drop Ninja [Fivecentnickle]