I'm certainly no expert on this, but I believe the discount is usually 40% during the rest of the year. That 50% was a special due to the need to fill more rooms, as I understand from reading posts on here from people in the know.
Not sure if it's still 40% but a friend of mine was pretty convinced that for August she could get it at 50% off once it gets a little closer based on her experience. Good Luck!