Bought mine from Meijer ....Groupon has good deals and u can buy on line as well anything but at the gate
Try drug mart
Found my ticket on Groupon. 1/2 off
Personally if you have the time I would do a two day and check for discounts. You really want a day at both to really enjoy the full experience. That place is good times and great fun food. But it is Cedar Point so lines can be up to 2hrs long. So that takes most of the time.
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