We just bought ours on the gate, got the NASA up close add-on aswell which we thought was great but according to the website it is $38 for normal adult admission and $28 for kids: http://www.kennedyspacecenter.com/buy-tickets.aspx
Not sure if other places might have it cheaper though...
Our Authorized Disney Vacation Planners are here to provide personalized, expert advice, answer every question, and uncover the best discounts.
Let Dreams Unlimited Travel take care of all the details, so you can sit back, relax, and enjoy a stress-free vacation.