$20-$30 depending on if you're an adult or a student. Buy online on their website for $2 cheaper
I got some on Groupon for under 25.00, Jim Henson exhibit included. Definitely worth it. Museum Guide Steph was super helpful and fun!
We paid 120 for a family year pass. It was cheeper then buying 6 day passes
I paid $30 with student discount... Extra $5 to see the Jim Henson exhibit
The CityPass is also worth it if you're planning to go to the science center or space needle as well
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