Camelcamelcamel - Easily monitor Amazon product prices and get alerts when they drop.
Magicube - Looking for the best Windows 10 apps? Check out these Universal Apps for PCs and Phones.
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.
Savelist - Found products you want but not ready to buy?
ShadowBid - iOS App - A simple iOS app to automate saving money on Amazon