More Case Closed Volumes that are OOS everywhere.I found in my local bookshop : r/MangaCollectors
CDJapan : News Tantei Konan Case Closed (Detective Conan) Gakushu Manga 1 Aoyama Tsuyoshi Akira / Original Writer Ota Masaru / Manga Kubota Kazuhiro / Manga BOOK
Case Closed, Vol. 62 (Paperback) | The Hickory Stick Bookshop
Case Closed, Vol. 90 (Paperback) | Cavalier House Books