Finding best and free iPhone Apps

Of course you'd like to find the best applications available for iPhone, and find them cheap, or even better, for free!
There is an app for that!

• Bargain Bin with Push: You can set "watch prices". If a watched app goes on sale for below the watched price, you receive a push notification.
  
• Pandora Box: You see not only apps that have price drops, but also newly released apps.
  
• App Popular: You can track apps. If a tracked app has a change of price, you get a push notification.
  

I listed the apps in the order I would recommend. I use all of them. I also use a very nice web site for this purpose:
appshopper.com

Enjoy the best iPhone apps cheap or for free!