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I have been on the lookout for the Publication Manual of the American Psychological Association, Sixth Edition - since my 5th edition became obsolete.
http://www.apastyle.org/manual/ - this manual is useful for students and tutors in showing how to reference and format to APA style (with examples). APA style is frequently used across a wide range of schools (and growing..) and is particularly popular within areas such as psychology, education, business, social sciences and law. There are a lot of books that try to simplify the APA style down for students, but every book I've worked at has had a few deficits when compared to the source manual. Further, they are targeted only at report writing and essay writing and thus have limited scope. On the upside, these books are usually a lot cheaper but with an APA manual at this price I feel that students would really benefit from going straight to the source, especially if you ever think you'll need to write a dissertation or you mark student papers.
The RRP that this sells for in the major Australian is $79.00 but can usually be bought overseas for around $40-45, but this is by far the best price I've ever seen it. The Abe Books reseller in this case seems to be Australian, and my copy arrived in less than a week. Overall quality good, with the book marked as having been printed in the USA; 2011 printing.
+1 for a solid deal, not many people need this but this stuff is hard to get!