It looks like there's none on the website. I believe my mother in law paid the adult price of $15.95. If you're military you get $2 off though.
Hi Linda! We created the Economy Annual Pass with seniors in mind. Please visit us at bluezoo.us for pricing. Thank you!
https://bluezoo.us/annual-passes/#price-admission Didn't see one either. I guess the only other choice would be to call them since chances are you will not get an answer from any staff members of this institution. This is a Google community site only monitored by Google users.
Thanks! Your answer is awaiting moderation.