I was also about to suggest Caminoteca in Pamplona. It’s just down from the Catedral, past the Bistrot café on the corner (side note: they have very weird art installation toilets in the Bistrot). I had a long chat with the owner of Caminoteca the other week about my very small blisters, which I didn’t want worsening. He’s a mine of knowledge, a really lovely man, and has everything you might need for every aspect of the Camino.