Spybot Identity Monitor - Get an overview where your account was leaked.
PSPrices - Games deals and prices in USA region. Subscribe to know when the price will drop for the game.
Snusbase - The industry leading database lookup.
GG.DEALS - Very good and clear site for best deals.
DeHashed - DeHashed is the largest & fastest data breach search engine.
IsThereAnyDeal - "When the price is right, you will play all night."