The last Grand duchess was published in a limited edition, so Amazon may have to get copies from the publisher -which is where Amazon gets its books Go to
www.addall.com (which searches Alibris and Abebooks, among others) 42 copies are listed (the Amazon edition is a paperback edition) ... most of the books are selling for more than $150 ... which makes me think that I should put up one of my copies (I have three different editions) on Ebay.
The book advertised on Amazon is paperback published in 2001 Amazon probably relies on a database, similar to Books in print, which forms the core of their website. So a computer may be showing that the book is still in print, but the publisher has not updated its own files.
In this case, the book is published in a paperback edition from a Canadian publisher - Key Porter Books.
You might want to contact Key Porter Books for more information ...
http://www.keyporter.com/faq.aspx#1