Amateur Astronomy Magazine - issues 1 through 54 for sale. This is a magazine covering a good breadth of astronomy topics. See the following website for more background information.
http://www.amateurastronomy.com/About.htm
The majority of these issues are in very good condition, with a few showing a bit of wear.
Back issues of this quantity would normally cost around $200USD, not including shipping to Australia. See the following link for more information (including all issues index, topics, articles, and by author).
http://www.amateurastronomy.com/Back_Issues.htm
Selling for $60 plus postage or best offer. Payment via direct bank deposit. Please PM me if you are interested.