Yep, not much of a discount available.
The only notable exceptions I can think of are for kids participating in the YES program, for Florida residents, and for military. Other than that, the biggest savings you'll find is about 1-4%.
If you're going to go, the one thing I recommend is to get the most out of it. A 3-4 day trip is one of the worst values, but that's how long many people go. Instead, look at a 2 week trip, with 10 days at the parks. That 10 day ticket is only about $60 more than a 4 day one.
Also, if you can go 2 (or even better, 3 or more) times in a 365 day period (like take a trip again next year, but a week or two earlier), price out Annual Passes.
Many of us who go regularly buy a small DVC contract for discounts on APs. Last year, DVC owners were able to get PAPs for $399, which isn't much more than a 10 day ticket.