Spotted quite a few mice on sale at dse and thought I'd share.
G602 Wireless Gaming Mouse $69.99
http://www.dicksmith.com.au/pc-peripherals/logitech-xxxx-wl-…
G500s Gaming Mouse $62.99
http://www.dicksmith.com.au/computer-accessories/logitech-g5…
G400s Gaming Mouse $48.99
http://www.dicksmith.com.au/computer-accessories/logitech-g4…
Not sure about the others, but I got my G400 at MSY for $50, so decent price.