Dominican Haven is available on Amazon as Kindle...perhaps you should look harder and in different countries"Dominican Haven" is sadly out of print. Last time I looked, online used booksellers were asking about $80 for it. There is no digital version available, and trust me I looked.
I'm not sure if you have any clout with the Museum of Jewish Heritage, the publisher, but I think that most would agree that at least a digital version should be available for public purchase. I lucked out as Professor Kaplan, the author, was kind enough to share a pdf of an earlier draft.
I am curious about the private manuscripts you mentioned ...
Is $80 too much to as for education?