App stalker is an interesting application, just released by S4BB Limited. The app actively scans BlackBerry App World and will list any applications that have moved from the paid section to free, or any that have dramatically dropped in price. It will sort these applications accordingly and you can quickly switch between "Free Now" and "Price Drop" via the tabs at the bottom of the app screen.
Prices for apps drop all the time, and App Stalker is a very easy way to be notified of these special deals. No longer will you need to keep checking on that app you want that you just can't justify buying. Now you can sit back and let App Stalker tell you when it is the right time to go get it. It is compatible with most BlackBerry devices and free to download from the link below.