In reply to nickcanute:
On a trip to the Costa in December we flew to Valencia and someone pointed me to a firm called 'Do you Spain' also known as OK Rent a car. I was quoted £15 for 8 days. Thought that must be a day rate, but no it was the whole cost. So we went for it and all along thought it must be a scam, but, heck if it was we would have only lost 15 quid. They picked us up from the airport and we collected the car (brand new fiat 500). We still thought it was a scam right to the end. They charged top end rate for a full tank and you bring it back empty, but nothing else. My mate had annual excess insurance so we didn't have to pay exorbitant rates for that and that is all we ever paid. Even after we got back I thought that my credit card deposit would disappear, but no all was ok. Oh, and they threw in an extra driver for no extra cost. Amazing! Europcar, whom I have regularly used had quoted me £180.00. I am probably going again in February so will try them again. I am still puzzled as to how they do it. Incidentally, don't know where you are flying from, but we found it a lot cheaper on Easyjet flying to Valencia than Alicante. The drive is longer, but still makes the trip a lot cheaper.
Post edited at 15:31