The Mac software ecosystem has a habit of doing bundles—nine or ten programs for $50 or so. It can be a good way to find new programs or cheaply pick up some programs you think might be useful.
Anyhow, two are running right now, available for the next week or so—check them out.
MacUpdate (rock bottom price on some big expensive programs)
The Mac Bundles (especially has some very good programs for customizing how the system works)