Dear Orange Cat:
It just so happens that I have a copy of the very book that you are looking for; it's on the shelf of one of my bookcases in my office. Unfortunately, I live in Taiwan, which is quite far from Canada.
I have the combined two-volume edition, first published in 1968. The Library of Congress number is 68-9140. My edition was published by Prentice Hall. The editors are Raymond E. Brown; Joseph A. Fitzmeyer and Roland E. Murphy. The editors are all of the Jesuit or Carmelite Order.
Of course, you are aware that The Jerome Biblical Commentary is a Roman Catholic research volume. It bears both the nihil obstat and the Imprimatur. The Foreword was written by Augustin Cardinal Bea.
I bought the copy that I own, for ten U.S. dollars, about twenty years ago in used book store. It is a valuable research tool, so I did not mind the trouble of bringing it with me to Taiwan [I'm originally from the U.S.]. In any case, in addition to Amazon, I would recommend that you browse in used/antiquarian book stores. You perhaps may also try Christian or Roman Catholic book stores. A local Roman Catholic Church, or convent, or seminary in your neighborhood is also likely to have a copy on hand. This is a classic Roman Catholic research tome, so it should not be that hard to find a copy. I really do not know how much more difficult it would be for you to find a copy that you could purchase for yourself. I have the first  edition; I trully do not know if there were later editions published after 1968. However, it would not surprise me to learn that there were subsequent editions. I imagine that there was a lot of research done during the intervening 40 years between 1968 and now.
Beyond giving you this information, there is not much more help that I can give you. If you need specific material on a specific topic, perhaps I could consult my copy and pass the findings on to you. To repeat, I think that your best bet would be to browse through used or antiquarian bookstores, or else religious bookstores. Good luck on your search. Best regards.