The cheapest place to get one is by far Worlds of Fun. A season pass, which is good at any Cedar Fair park goes for only $59 which is $30 cheaper than MiA or Valley Fair. Could this be because it is 700+ miles away from CP, and MiA is only a 6 hour drive? I dont seem to see too many Missouri license plates in the Cedar Point lot, however there are tons of MI, PA, NY, IL, and IN plates in the lot, as well as an occasional MN.