Camelcamelcamel - Easily monitor Amazon product prices and get alerts when they drop.
Pricy - Amazon price watch
GlassIt.co - Find discounts, without invasion of your privacy. Download Glass It Price Tracker mobile app or browser extension 🇺🇸
Price2Spy - Price2Spy is a price monitoring, pricing analytics, and repricing tool, meant to help eCommerce professionals keep an eye on their competitors or retailers.
PriceLocal - Find local stores that match Amazon's price
Pricepeek - Compare prices of the same product across all Amazon locales