Great deal on the Logitech M570 Trackball - "today only" (seems DSE has extended the sale) $53.29 online price.
Click and Collect available (no shipping fees).
Can price match at Officeworks for $50.63 - if you want it straight away.
Otherwise, you can get it on Dick Smith eBay store (for $47.58 with the coupon CTECH20)
http://www.ebay.com.au/itm/LOGITECH-Wireless-Trackball-Mouse…
EDIT: This deal is still on, despite it being past 11.59 pm AEST.
How much is it normally ?