What's the cost for adults and a 9 year old?

Same as a adult

Children 8.59 most times and days adults are 10.09 before 5pm and 12something after that. If you want a deal Tuesdays the movies are 5 dollars.

I purchased a set of 4 movie passes at Costco for $36. Them I just show up at a time of my choosing and select a movie to watch.

Hello. That depends on what day and time of the day you go, and whether you buy tickets online or in person. You can see the pricing on the website, nevertheless.