Avoid the main agents – Hertz, Avis etc – instead try Bravocarhire.com. It seems to be a British-based site which puts you in touch with local car hire companies. We were quoted €54 for two days' hire with Spanish firm Niza Cars, a free additional driver and only €4 more to have insurance excess at zero. The international companies were more than €110.
One thing to watch. They give you the car full and you have to bring it back empty. So you pay for the fuel up front.
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