We'll be getting ours from the SeaWorld website (advanced purchase option for discount $20 off) or (regular price ticket purchased in advance with dining thrown in).
My son is doing one day in September and one day in November (two Orlando trips), so for him I'll get the fun card, $99 for visits through the end of the year. He'll do two visits, and doing this brings the cost per visit for him to about $50 vs. $80.