How about this for self-study of English listening and speaking? I bought it 40 years ago for about 300,000 yen for all 12 volumes, but I couldn't keep it up. Tapes for BOOK 7, 8, 9, 10, 11, and 12 are unopened and brand new. The textbooks have never been opened either. There are a total of 36 cassette tapes. I will send it via Mercari anonymous delivery in a 100-size box.