A piece of happy news has come to my attention; a hard-working friar of St Vincent Ferrer Priory in New York City has gotten out a reprint of the 1939 Dominican Rite Altar Missal. This Missal is in smaller format than the large 1933 and 1965 altar versions, as it was intended for travel. The use of it still requires updating the calendar to 1962 (download this on the left-sidebar at Dominican Liturgy), and use of the 1961 revised rubrics for collects as well as a couple other rubrical items, but it is eminently usable and in print!
A friar who uses it tell me that the paper is thicker than that used in the original printing, so users will probably want to get a book-cover, e.g. one for a large Bible, so that lies flat. I believe it also needs ribbons and tabs. You can purchase it at Amazon or at many other used-book sites on the web.