Oh wow!! That's the sort of thing I'm after! Is there anywhere particular I should keep my eye out? I'm in Australia, so I just keep checking web pages.
Somebody may post an update on here or you can check the ticket deals on the homepage of the Seaworld website. The summer season for the Central Florida theme parks including Seaworld starts Saturday June 23rd so deals should be coming out very soon. Sometimes the parks wait a few weeks into the summer season to post deals depending on what their attendance numbers are during the first few weeks of the season. So if no deals show up in the next week then try again before mid July and you may see something then.
Here is a link to the Seaworld site where you can find deals (Scroll to the bottom of the page to see the ticket deals. This is where something would be posted if there is a special summer deal):
http://seaworldparks.com/en/seaworld-orlando