https://www.statueoflibertytickets.com/Statue-Of-Liberty-Tickets/ Here is the official website. Book early because they sell out. Do not buy from vendors as they may be fake and you be out of your $. Also arrive early to get through security. Book the early tours as later times gets really busy and very crowded and you will not get to see a lot.
I would go to statue cruises for pricing. There are different prices because there are 3 different levels. I believe to go to the crown is $21.50 for adults but this includes your ferry ride and Ellis Island. You can also research tour company's and bundles. They sell tickets that bundle the statue and other popular tourist places at discount rates
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