Lifehacker Deals - https://twitter.com/LifehackerDeals | Offers many great deals on anything from iOS and Android Apps to PC parts and even clothing and household stuff
Kotaku Deals - https://twitter.com/KotakuDeals | Same as LifeHacker Deals
Dealsplus - https://twitter.com/dealsplus | Many great deals on anything you could think of, from clothing to restaurants

That's my list for now.