Smartprix - Smartprix is an app by Smartpix.
G2A - Enjoy the vast offer of Steam, Origin, Uplay, Battle.net, GOG, PSN and XBOX CD-Keys at the most attractive prices on the market. Don’t overpay – buy cheap on G2A.COM!
Price Tracker for Amazon - Price Tracker for Amazon is a shopping app that allows you to browse for favorite products from famous online stores know as Amazon for a better price.
Green Man Gaming - A digital distributor for video games.
idealo - Idealo is a free to use mobile application that helps you to find products, compare price and make an informed decision.
GOG.com - DRM-free game store, selling both new and old titles. No clients required.