Last year we rented a car one day, just to go down to baby beach and a little cruising and it was about $50/Dy from the Hertz counter in the Hotel.
This year we're staying for 2 weeks and are definitely going to need a car for a couple of different days, just not all at once. So where is the cheapest place on the island that we can rent a car that anyone has had any experience with? Just looking for a random day here and there.

Our last two rentals were with Aruba Royal Car Rental and Amigo Car Rental. Both were fine companies to work with priced reasonably.

Royal delivered the SUV to our resort. Amigo brought the vehicle to our resort and then dh and our friend returned to their office with the driver to fill out the paperwork.

To shop around there are more rental agencies links at http://www.aruba.com/whattodo/rentalcars.php

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Excellent, thanks a ton!

We used Econorental. We actually had our bell man at the LaCabana call (he struck a deal for us) we rented a small car for the week at 125- unlimited mileage