Depends on the event it's a set price for the museam, see the website but you get in free with the purchase of a ticket to a puppet show. And you can sometimes find deals on those.
Tickets for the Museum is $12.50 for everyone 3 and up. Child (0-2) Free.
I payed $20 but I think it can differ depending on what's being offered at the time. The website should have details.
You can get free general admission passes from PINES libraries around the state of GA or they cost about $13 on site. If you wanted to see a performance, those are $29, but include the general admission as well as a create-a-puppet workshop. Parking is free.
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