Buy one get two (years, that is...obviously)
Going from experience, the "buy-one-year-get-two-years" deals typically happen in the Summer. I got mine about halfway through June two years ago. Though Universal doesn't usually leak when it'll happen, Summer is the best time seeing as how kids are out of school and driving parents batty. Might as well let 'em drive you batty while you're in line for The Hulk, I suppose.
Also, seeing as how you're a Team Member and all, you do get a discount when buying them for others (relatives, kids, mob bosses you owe...). I think it's 10 percent, but I'm not entirely sure.
Hope that helps!