AppShopper is a great way to find free and inexpensive apps. Just put apps into two categories...Wish List or My Apps. Each time an app is updated, price increased, or price dropped you will receive an email notification. If you turn on the AppShopper notification in your notification settings on your device you will receive a pop-up notification on your phone. You can use the website version (set up an account) and it will sync with your device. Go to http://appshopper.com/.