This website (the Unofficial SAAF website) has a contact address for the author:
http://www.saairforce.co.za/forum/vi...php?f=2&t=6601
Alternately, the Australian National Aviation Museum in Moorabbin, Melbourne had a number of copies available when I visited in last December. (I am a museum visitor with no affiliation to the place.) I don't know if they post internationally, but you could enquire. Their website is:
http://www.aarg.com.au/
There's usually a contact details page within.
Good luck.
...geoff