Not quite as cheap as this deal for this mouse in January, but $17.80 (~36%) off a $49 mouse is a bargain in my books. Officeworks were happy to pricematch their $49.95 ticket price taking the price down to $29.64, or a ~41% discount.
As with most Logitech products this Bluetooth mouse is a fairly well made device and is pretty comfy to use (in Windows 8), certainly better than the Microsoft Sculpt mouse I had the displeasure of using.
Upon a quick check around Melbourne, all JB Hi-Fi stores had stock whilst Officeworks stores were a mixed bag showing "limited" for many locations.
Cheaper here
http://www.bigw.com.au/product/logitech-wireless-mouse-m557/…