I went to the grocery store, Albertson's, and when I got home I went through my receipt and all the 'reading material' they give you these days.
One of them is a coupon for $20 Off for an Adult 1-day admission and $12 Off for 1-day Child. Expires 12/31/12
and use promo code
I don't know if everyone who buys something at Albertson's will get that coupon or if you have to purchase a certain amount or be at a certain 'shopper level'. I have no idea how it works.
But, there is an option to take the coupon to Sea World and get a $15 Adult discount and a $7 child discount. And it's says "limit six people per coupon"