I have an idea how this might have happened. I am a annual member and the price to become an annual member is significantly more than a one-time admission it is worth it in my opinion to support the wonderful museum but it is double if not more of the regular admission price. That may have been the pricing you saw. Just an idea.
We're not sure what happened there, but the ticket prices for entry are posted on screens at the Admissions Desk, and on our website at visitmosac.org, and they both list the same prices.
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