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

DealExtreme - Online shopping for cool gadgets at the right price.

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.

Fasttech - Fasttech is one of the best platforms for buying gadgets and electronics at the best rates.

Pricy - Amazon price watch

Monoprice MP Select Mini - The Monoprice Select Mini is a low-cost 3D printer that takes pride on being built with quality materials and components, while at the same time being shipped fully assembled and calibrated.