CheapShark.com is described as 'CheapShark was created in March 2012 with a very simple goal in mind: make finding the best game prices easy!'. There are more than 10 alternatives to CheapShark.com, not only websites but also apps for a variety of platforms, including iPhone, iPad, Playstation and PlayStation Network. The best alternative is AppAgg, which is both free and Open Source. Other great sites and apps similar to CheapShark.com are IsThereAnyDeal (Free), GG.DEALS (Free), GameGator (Free) and Kinguin (Paid).
Very good and clear site for best deals. You can search for current best discounts for a game, set price alerts, looks for historical low prices across multiple stores (not just one) etc. Very customizable alerts.
Marketplace to buy/sell game keys for a myriad of platforms including: Battle.net, EA Origin, Free2Play, GOG.COM, NCSoft, Nintendo, PlayStation 3, PlayStation 4, PlayStation Vita, Steam, Uplay, XBOX 360, XBOX ONE, and others.
iOS App that notify you about all PlayStation Store Discounts! No matter if game is currently on sale or not, you will be the first to know. Moreover, PS Deals is fully loaded with reviews, videos, screenshots and detailed description for every game!.