This Spanish-made Roca Classical was purchased cheaply from a second-hand store in Arnhem. Testing the preamp later at home as the amplified signal had problems, I found that the piezo was not very reliable and I replaced it. Later I ordered a couple of piezo replacements as well.
Also I added some discrete sticky fret markers as it was rather strange playing a completely unmarked neck. It sounds very decent for a $100 guitar, as the top is massive enough to get a deep sound.