Software Ambience Corp. has DaisyDisk in the Mac App Store for $4.99 (9.99 – 50% Off) for a limited time. Deal expires February 7, 2013.

DaisyDisk scans your hard disk and presents it as an interactive visual map where you can easily spot unusually large files and remove them to get more free space.

Using the map, you can browse your disk, view file descriptions and content, and remove unneeded files with drag and drop.