I donīt know about "used" , but I have a guitar maker near me ( Barrio Salamanca ) ... It fascinates me every time I pass by this small store because the craftsmanship is superb ! Itīs on Calle Hermosilla . There is also a more Central guitar maker on Calle Gravina in Chueca . Bear in mind , also , that the main department store , El Corte Ingles , Has a substantial collection of ( new ) guitars for sale . Theyīre beautiful ... Itīs my favourite instrument by far , I just wish I could play it !