Yes books are expensive here by american standards but I have found that they are almost exactly the same as the euro price on the back cover. Our libraries are excellent so I would suggest they join as soon as they have a permanent address.
I book I have just got out the library which might be interesting for them particularly if they are coming to the Auckland region is
'Slipping into Paradise', by Jeffrey Moussaieff Masson, I found it very interesting and I have lived her for a long time. He is the man who wrote "the nine emotional lives of cats".I will go online to our library and see what they recommend, but often the best books are by the government printers or local university press and therefore difficult to get overseas.