I also use Econo and have been very happy with their cars and service -
www.econoaruba.com I guess you could go door to door to all the rental car agencies at the airport and try to get the best deal but I would never do that. Takes too much time and too much of a hassle to save $10 or $20. Also, you do run the risk of not getting the type of vehicle you want. During the busy season, they do run out of cars, especially the more economical ones.
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theoder
Car Auctions