Hello! The best way to go about it would be to buy the first one online, then while on site, you can buy add-on IMAX tickets for the other 2 shows, bringing down the cost to $4 or $5 each for the other 2 shows. In total you would need to purchase 3 tickets, one for each film.
You will have to buy a ticket for each show. I would check with the tech to see. I do know that they have discounts if you are a member. Being a member is a great way to enjoy all the museum has to offer whenever you want.
It's like a mini movie theatre...
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