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.

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

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

Price Tracker by Relbis Labs - Price Tracker is a command-line tool for monitoring the prices of productsFeaturesTracking prices and availability of products.Tracking Amazon Kindle books.Displaying products information in a terminal.Exporting data into Excel and YAML files.

StreetPricer - StreetPricer is an ultimate repricing and automated price tracking tool for catalog and non-catalog products that will, in turn, let you find the exact value of the items listed on eBay.

Pricy - Amazon price watch