I've always gotten the deepest discounts by calling the number listed on the Universal/BMG section website and inquiring about the best rates possible. I know we bought some tix this past August for our Sept trip, and the website discount was only 20 percent off if you're a USO AP holder. I called and ended up getting 50 percent off our entire order because it was some sort of Florida resident appreciation month. Our tix were $42 each.
And I might have it backwards. It could have been 20 percent off the website for FL residents, and I called and was informed it was AP holder appreciation month. Either way, I was extremely glad I called and ordered tix by phone, because the discount surely wasn't advertised on Universal's website, nor the BMG website.