They do have free days
The best option is to get the city pass, that way you will see like 9 atractions in the city (including the aquarium) and you will save like 100 dollars.
Children pay the same but if you get the Cyty passes you get half in all the museums and the most important buildings Willis tower the sears tower and the John hackot observatory
General admission: Adult $39.95*, child (3-11) $29.95* Chicago residents: Adult $19.95*, child (3-11) $14.95* A 50% discount! Senior was $3 off adult
That's right about 70-80
Around $70
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