AliPrice - AliExpress Price Tracker app lets you track the price history of any item from many online retailers like AliExpress, Daraz, and Amazon, etc.

AverageFinder - AverageFinder is an all-in-one product value tracking service for eBay that will provide all the information related to product selling and purchasing.

idealo - Idealo is a free to use mobile application that helps you to find products, compare price and make an informed decision.

Bidvoy - Bidvoy is an effective product value tracking service for eBay that is providing complete requirements as far as auctions are concerned.

Camelcamelcamel - Easily monitor Amazon product prices and get alerts when they drop.

PRICEFY.IO - Monitor your competitors' products and prices with ease. No single URLs to paste or proxies to rotate, just put your competitor's domain and monitor his product's price daily.