I believe a listmember here was looking for them. Both of the dealers, if I
recall were in Oz.
abebooks has a search engine which is a little particular. Allen or Gerald
Allen will get a very different list of hits from Gerald R. Allen. Likewise
I found some works with keywords related to the one which I originally
thought would be effective, so a little word play may be necessary.
I hope this is a use to those looking for Allen's (and other) books.
All the best!