Edit: oops. Didn't see this was regional... sorry to jack your thread
There is this limited edition secret pass in MI that nobody knows about, they only make about 100 of them each year. It is a no-blackout-dates season pass valid at 20+ resorts in the state; it includes 2 of the 3 local dirt hills I ride frequently, as well as some of the bigger resorts up north.
I had already purchased a pass to Crystal Mountain when I found out about it, but at $550 for 20 resorts it was a no-brainer. I would've paid that much just for the 2 hills near my house.
Bonus: the top-secret-pass is "transferrable" at all but one or two resorts, so when I do ride at Crystal, I can let my wife or my nephew use it.