Deals tend to disappear when occupancy/demand is up. If the early 2000s was after 9/11, there would have been lots of deals as theme parks were fairly desperate. Today, parks don't need to offer a ton of discounts. That due in part on the fact that both Disney World and Universal Orlando have new attractions that just opened.

It's unlikely that you'll find any in-person discounts greater than the ones you'll find at the links provided by other folks above.