ACI has free parking for up to 3 hours. After that, there?s a facility fee (I don?t know how much) which can be waived with a 20 gallon or top off if under 20 gallon, fuel purchase. Fuel was $5.16 per gallon.
So basically, I don?t think that you?ll have to pay an arm and a leg to do what you?re looking to do if you use ACI.