I know I just missed the recent one, but I've got about $50 worth of apps that I need (want) and can probably wait until their next sale (like the recent 20% off $30+). Anyone have any ideas on the frequency? Are they on a set schedule or just random? Is it an end of month type thing?

I see they've got an "Election Winners" sale with some of the most popular of a certain category, but I already own all those on that page that I need.