Buying boat accessories or spare parts in Spain proved difficult, as the selection in the stores is small and expensive. When the opportunity presented itself, we purchased online in Germany or the UK and had the package delivered to the marina. It used to work well until we came across a German store that gave us a hard time. Fortunately, we came across an online store in Spain, IRASMUS.
As a rule, I do not make recommendations. IRASMUS is a store I like to write about because the communication is fast and competent. The store is well sorted, and the prices conjure a smile on the sailing budget. Convince yourself here: