Libraccio is a chain of bookstores famous also for its used books section, this one in Navigli is great because of it’s position, right on the small Naviglio channel so if you’re walking around you might want to stop by and find a second hand book for 2 euros. They have other two small shops nearby, one for school stuff(notebooks, etc) and another one for new books. The variety is mostly of Italian books but they have a good English section and even something in French, Spanish and German(just don’t expect to see the novelties). The books are not ordered alphabetically so if you’re looking for a specific book it can take ages to find(although they’re more or less divided in genres), the conditions of most aren’t very good and there’s a funny smell inside, but for 2 euros, what can you expect?