They don't have stamps anymore they have wristbands. All wristbands are the same price for all ages. They're are tickets also but I'm not sure how much they cost or how much it would add up to :)
Buy your entry tickets and wristbands for rides at Circle K BEFORE the fair opens, cheaper. Avoid the last weekend as the ride lines are very long! There are kids rides...plenty to do!
They have wristbands for unlimited fair rides. The only stamps I know of are for reentry into the fair.
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