This is the best place to buy fruit I've found so far in Bilbao. Note: I have not had a lot of ability to explore and I missed the Saturday open market.
This place had more less-usual apple varieties than other places I checked, including inside Erriberako Merkatua/Mercado La Ribera.
This is in contrast to València, where the best fruit sellers I encountered were in the Mercat Central. They carried more different fruits than the average greengrocer, including loquats and Alpine strawberries.

