How can I view the current price of an app I've previously purchased? I want to view the price of Cut The Rope 2 on the iOS App Store. However, because it's an app I've already purchased, the price listing has been replaced with the "redownload" button.

Is there a way to view the current price of an app I've previously purchased?
The best place I have found for this information is AppShopper.com. They list all of the current apps on both (iOS, Mac) app stores. They track the current price as well as the price history and update history for the app.