BOGO admission deal
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On Saturday and during the NATO conference, the MSI offers two-for-one general admission if you print out a voucher and bring it along.

Click here to download the voucher.

The fine print: The deal does not apply to online ticket sales; one full-price adult admission ticket must be purchased in order to receive free admission for an adult or child. Extra fees may apply to some exhibitions, including "Mythbusters: The Explosive Exhibition."

Regular general admission to MSI is $14-$15; $10 for kids ages 3-11. City of Chicago residents receive a discount.