Sorry Val & Bill, I know this post is old but I only just picked up your query about our car hire.
I used comparison sites like Kayak, Travel supermarket, etc. The one I used for Corfu car hire was Autos Europe and the final hire company was Kings. It was a very good personal service, meet and greet in arrivals and they carried our luggage to the car. Excellent service. I usually book our holiday late (within weeks) and was checking car hire prices which was more like £70/ week if I remember correctly. Checking nearer to the date the prices had dropped so at less than £50 I booked it.
We have just got back from Fuerteventura, having booked the holiday late again. Car hire was £38.12 for the week. This was through Autos Europe again, hire company was Thrifty (Hertz)
I think if you can risk leaving it late, you can get the bargain as the hire companies would rather rent a car out cheaply than not at all.