Is the thing that makes these a good deal the fact that they can be used on 3 non-consecutive days? We will be at Universal for two days this December, and from the Universal website it looks like a two-day ticket is either $115 (one park per day) or $135 (park-to-park access). So with the Costco tickets, we would not save money compared to the two-day ticket but we would have an extra day that we could use on our next trip? Am I understanding this correctly? Also, does anyone know if the Costco tickets are one park per day or park-to-park?
Thanks! Kids (all teens!) are SO excited about Harry Potter World!