Barger and Barclay used to sell direct, and they were in Ft. Lauderdale for quite a while. The only person I know who might know if there’s still anyone down there handling their music is out of town for a week, but I’ll ask her when she gets back.
Dear Margaret, in my former job I had to do music related research sometimes. A great help have always been (american) music libraries. When searchign Wolrdcat you can see that one copy seems to be at the Koninklijke Bibliotheek in the Netherlands and another one (seems not to be specifically for flute and harp) at the Free Library of Philadelphia. If you are or could be affiliated with the University of South Carolina (I had contact with their music library) you could make an interlibrary loan request. I do not know if this is of any help to you, as it seems to be complicated … . Best wishes and good luck Anja