You may find "free" PDF scans on various document-sharing sites. However, these are often: Poor Quality:
Leo, all of twelve years old, had no teacher. He had a YouTube account, a tuner app, and a stubborn belief that a PDF could be a kind of magic. He found it easily—a scanned copy of the 1934 edition, complete with coffee stains and marginalia from a previous owner named “Edna.” He downloaded it to his tablet, propped it against his music stand, and opened to Page 1.