One Word Domains - Database of all available one-word domains
Camelcamelcamel - Easily monitor Amazon product prices and get alerts when they drop.
Domainz.io - Premium domains, for not so premium prices
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.
Undeveloped - Domains you never thought were available
Pricy - Amazon price watch