We bought a used car online using Car Outlet.Es. and would recommend them.
I was obviously anxious but they have good reviews and we were spending around £600-800 a trip on hire cars. However, used cars are expensive in Spain.
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We made a link with Lisa, who spoke good English and suggested cars that might fit our brief. Once we had narrowed it down to a 4 year old Ford Fiesta, she showed us the car via video, when we could ask questions. Any minor scratches were pointed out and it came serviced and with a warranty too.
They do want a deposit as soon as you agree to buy, which felt scary, but the whole process went really smoothly and Lisa couldn't have been more helpful. The car was near Alicante but we were flying into Almeria, so they delivered it to the airport for 100€. This meant we could immediately cancel £1,300 of car hire for our next two trips.
This was 6 months ago. Since then, we have had a minor problem with a piece of rubber coming away from a back window seal (not covered by the warranty but repaired for 15€) but otherwise have been very pleased.