(Not that you can buy them, but since you have an interest in that area...)
When you're in Santiago de Compostela you might want to visit the museum of the Cathedral (it's accessed from Prazo Obradoiro) . There is an exhibit there with replicas of the instruments that the various figures carved in the famous doorway are holding.
I think if you keep asking as you go along, you will find what you're looking for. Of course it would be good to help your own cause by learning the necessary vocabulary in Spanish if you don't already know it.