S4BB is running a 50% sale on all of their popular productivity and self-improvement apps as well as their series of ebooks in the CrackBerry App Store. You can snag some great apps for a huge discount here. A few of their apps have some crazy price tags, so if you've been holding out now is your chance to get it while the gettin' is good. Check out the full list of apps below. The promo runs through September 16th. For more information click the links below. You can see all S4BB apps here in one shot.