Shame you missed the motor show at Torre Pacheco recently.You get some good second hand cars there.
There is another place worth considering and you can see the garage from the N332 going to San Javier.I have lost his card unfortunately but it is behind theYorkshire Linen shop.If you can see the red mechanic garage its round the corner from there.They have good cheap cars and they are English.
Sorry directions are a bit vague but someone will know where I mean