$15 for adults and $12 for Senor and children. The Duval Loop Bus is free and gets you to most of the tourist spots.
Parking for the Butterfly House is directly behind the facilities which I believe is free. We did not find this out until we left the building however.
Add on the cost to park your car. It's $4 an hour on the street. It's $10 for two hours in the parking lot right next to the Butterfly house. If you have a longer vehicle, the parking lot is your better bet
$12 for kids over 12. $15 for adults.
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