We used to be able to get the "Performer" brand lamps via K mart in New Zealand, rated at 240 - 250 Volts
Undoubtedly the same bulbs sold stacked on the shelves in the Australian K marts. Aussie light bulbs have been rated at 240-250V for many years to take into account 250V being present in many areas.
I suspect Kmart (and most Kiwis & Aussies) aren't aware of the 10 volts nominal difference between the two countries...after all NZ is seen as the de facto 7th state here and with the electrical fittings being the same no one thinks twice.