Members of the military and up to three direct dependents can get into SeaWorld or Busch Gardens for free by registering here. This deal is good thru December of 2012. This program, sponsored by Anheuser-Busch offers free admission to these parks for military families:
SeaWorld Orlando, San Diego, or San Antonio
Busch Gardens Tampa Bay or Williamsburg
Water Country USA
Those of you who are not military families, SeaWorld offers you $10 off when you purchase your passes online. And so does Busch Gardens: Busch Gardens Tampa Bay - $10 off Single Day Ticket.
Find more free Events here.
Mommy's Wish List Disclosure: I am a compensated SeaWorld Wildside Mom Blogger.