I hope I don't get in trouble for this. But if you go to retailmenot.com, you can search for various discount codes. There's a ton for seaworld. However, its only one day fares, whereas, if you get the adult fare at the child price, you can go two days vs. one.
Just something to think about.
For me, the difference is $20 total - between getting discounted tickets and going directly through seaworld.com