Rates change based on season, type of vehicle, length of rental and vehicle availability. Your best bet is to go online and see current rates for the vehicles. If you're going to be there in less than 3 hours, just walk up to the counter and ask.
Around $5...to $600 I think, or if you have coupons, you can save a little bit more. And also, it depends on what kind of car you are renting, this can vary; if you rent an economic car, it will actually cost you less money.
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