Camelcamelcamel - Easily monitor Amazon product prices and get alerts when they drop.
RetailMenot - The RetailMeNot mobile app allows you to find deals on the go for both online shopping and in store shopping.
GlassIt.co - Find discounts, without invasion of your privacy. Download Glass It Price Tracker mobile app or browser extension 🇺🇸
Dealspotr - Dealspotr is like Wikipedia for deals.
Pricy - Amazon price watch
Honey - Honey is a browser extension that automatically finds and applies coupon codes at checkout with a single click.