The previous cost of the Premium AP was $460.
As far as I can tell, the only way to get the Premium Annual Pass is to buy the military rate pass. If you are either in the military, or work for the Federal Civil Service, or you're a DoD contractor, you can get your tickets at the ITT desk at Los Angeles AFB. The military rate for the Premium AP is $483.
Click on
this link and then click on the "Ticket Price List" on the left hand side.