Edit: People reporting limited stock/out of stock online. Try your luck in store.
Got an email from MSY (typos and all). Can't go wrong with a wireless mouse for $5. Got some other stuff as well: http://www.msy.com.au/viconline/377-promotion-products
Store/State Online Stock Levels here
You need to change the store location to see online stock levels in states with online stock still available or contact the stores with stock.
Hurry up and open msy varsity lakes!