If any one is interest the book "The Quiet Earth" by Craig Harrison has recently been republished (in July this year) as both a paperback and a Kindle edition. It looks like the paperback version has more or less sold out though there is a copy or two available at Abebooks.
The novel was originally published in 1981 and reprinted in 1986 after the movie of the book came out. Since then it has become a hard to get book with copies selling for several hundred dollars each.
This book has been on my wishlist for years so I just bought a paperback and Kindle edition.