As you know there are days/period when not free apps are free. You cant see/find them with standard apps store.
After searching good application which will track all new apps or changes on other apps which already is in store i stopped on the one - Appsfire.
With the app i saved a lot money. All i do is check everyday for great free apps.
Also you have ability to find apps which at the moment not free but price is dropped.
All i recommend is install the awesome app and track apps you like.
