Have you thought about getting the Super Grover passes? They are usually on sale for Black Friday at 25% off.....they would be about $158 plus tax after the discount is applied, and they'll be good for the balance of 2013 plus all of 2014. And the added bonus with these vs. the Fun Cards is that they give you access to all the SW parks in FL (SW, AQ, BG and Adventure Island) and all the passmember benefits (free parking, a discount at DC, discounts on dining, etc.). You'd probably get some good mileage out of it if you are planning on going on multiple trips.
http://sesameplace.com/en/langhorne/Passmembers
Also, I think they start offering the Fun Cards near the end of the year that are good for the balance of the current year plus the entire following calendar year, so keep watch on the website. You might just be able to buy the Fun Card before you go on your Christmas trip and be able to use it for 2014 too

. SeaWorld San Antonio has already released their 2014 Fun Card + "Fall Free".