Logitech MX Master Mouse $79 Delivered or C&C @ Officeworks
Price Reduction on the MX Master at Officeworks :) Seems to be only black unfortunately. You could also 30 day price guarantee at The Good Guys to get a $58.80 store credit back (netting a $9.20 saving).
Also if you want the stone, can possibly price match anywhere for $79 off their official website Depends on whether the store honours the price match on a different colour.
Quite a good price for this mouse!