Had an email off Themepark Insider with the info below,.
its only available at the theme park gates or direct from the seaworld website,
excellent if you have a couple of under 12's in your family
Through the SeaWorld Cares offer, now through Dec. 31, with each full-paid, SeaWorld single-day, adult admission purchased online, any child age 12 and under gets a $5 admission, all of which goes to fund non-profit organizations that are working right now on wildlife conservation projects. The offer is good for SeaWorld San Diego, as well as SeaWorld parks in Orlando, Fla. and San Antonio. Families even can choose which wildlife conservation effort receives their donation. Complete details are available at http://www.SeaWorldCares.com.