Depending on what tour you want, it costs anywhere from $20 to $35 per person.
Check their website. I managed to book a tour with 2 days notice.
I recommend you check their website to get up to date info
If you check their website, you can book online and see the price for your chosen day/time. They typically sell out weeks in advance, so it's best not to wait.
$20 for General admission
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