It depends on the tour you take. Each tour is the same except for the whiskey you will taste at the end.
https://www.jackdaniels.com/en-us/visit-distillery This will help you with tours and prices. Personally 'The Angel's Share' tour is the best as it includes samples of Single barrel collection and limited edition whiskeys.
Mainly around $20. Some a little more depending on the tour you take. It's well worth it.
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