According to a sighting and photo on TFW, the wave 5 Deluxes have been found at Northlands Myer... which is Crosshairs and Spinister... skipping over wave 4 (Impactor, Mirage and Barricade) at Retail.
Hopefully wave 4 does end up here somewhere (they appeared on Amazon Australia as domestic stock, so we did get some stock in Australia), but it mustn't have been much if wave 5 is now showing up.
(maybe Hasbro Australia made sure we got in enough wave 3 stock in Australia so that fans weren't complaining later about not being able to get a set of three Reflectors)