Kindle Direct Publishing (KDP)
Lulu distributes print books to Amazon, Barnes & Noble, the Ingram network, and more, including its own Lulu Bookstore.
Commission: for each customer purchase, Lulu takes a commission of 20% of the profit for printed books and 10% for ebooks.
Best quality in printed books.
It allows physical distribution in the USA of your self-published book, so if you are planning to sell on this country it is something to take into account, complementary to other online distribution platforms.
It has arrangements with some distributors working in Spain and worldwide for physical distribution. It also allows to sell online through Amazon and Casa del Libro marketplaces.