You Can Now Buy A 4-CD Set Of the Holy Father Reciting the Rosary In Latin
Latin was chosen because of its universality.
Now, I tried to hunt it down on the Vatican Bookstore site, without success. For now, this might have to be an item you buy only there in Rome in person.
I have made some progress with my efforts, begun last year, to say the Rosary in Latin. The only big stumbling block has been my inability to find the Latin translation for the Prayer Before the Rosary ("O Queen of the Holy Rosary, thou hast deigned to come to Fatima to reveal to the three shepherd children the treasures of grace...".).
Of course, I have the Paters, Aves, and Minor Doxologies by rote, along with the Salve Regina, and have for some years now. I still have to read the Latin for the Fatima Prayer, the Apostles' Creed, the Prayer After the Rosary, the Prayer to Saint Michael, and the Guardian Angel Prayer, as well as the actual announcements of the Mysteries.
Progress comes slow.