I am really not sure I would say call to set it up you may even get a deal plus a tour guild to show and tell!
Children tickets are $17 each and can be purchased online with a time reservation. I didn't personally see any guided tours while I was there though.
For regular admission it was $22. You didn't state how old the students were. So, depending on the age the cost can be cheaper. Try going online perhaps they have more info there.
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