Price Drop: The Weekend's Best App Deals, January 30

We've got a couple of dueling top-shelf calendar apps on sale this week, so pick your team and run with it if you want something that puts Apple's stock calendar app to shame. But wait, there's more! We've also got dueling price chops on to-do apps, note taking apps that let you write on the screen, and even competing maps of the constellations. It's an ultimate app price drop showdown this week, so to arms, to arms! And to the App Store!