We have two legs of our trip where we would like to rent a car. We will have 5 days in Arles; and will want to see much of the surrounding area during 2 or 3 days of our stay. In Spain, we would like to rent a car for 2 to 3 days after our stop in Sevilla to tour the white hill towns on our way to Nerja.
I've been checking costs on some of the recommended sites for these areas (AutoEurope; Carjet; Hertz; etc.) and finding rates are nearly $100us/day for economy/compact cars. At this kind of rate I'm inclined to refine our travel plans once we arrive.
Are we likely to see costs increase substantially if we reserve once we arrive?