I find Australia to be the most difficult to locate books, and they also suffer from high prices too. Recently I've found multiple books that aren't available in Canada and vice versa that aren't in the US but are everywhere else!
There are many versions of
Of Human Bondage available and unfortunately the quality varies widely. It took some creative searching and downloading of samples to choose one. I decided to go with the Modern Library edition by Random House since it has a lengthy intro by Gore Vidal and commentaries by Theodore Dreiser and Graham Greene. It was $2.99 in the US. The Kindle version has the new PageFlip, enhanced typesetting, X-ray, etc.