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Logitech G602 Wireless Gaming Mouse with 250 Hour Battery Life
On Lightning Deal
RRP USD$79
Review from Tech Power Up http://www.techpowerup.com/reviews/Logitech/G602/4.html
That's about 73.60AUD, plus any conversion fees if you don't have a 28 deg. Megabuy will sell it for $70.21 + shipping fees, so it isn't a huge saving and you've got to wait for it to come from overseas. I'd call this pretty average overall.
Other prices: http://staticice.com.au/cgi-bin/search.cgi?q=logitech+g602