Camelcamelcamel - Easily monitor Amazon product prices and get alerts when they drop.
PriceCute - Keep up with your competition's pricing on Amazon
PriceSpy - PriceSpy helps you save money when shopping online.
Keepa - Price history charts and the option to be alerted on price drops for all Amazon sites.
Pricy - Amazon price watch
Locotracky amazon price history comparer - We are the amazon price comparator, we inform you every time a product drops in price so you can save on all your purchases.