Four different Lytworx motion sensor lights are on clearance at Bunnings for $5. I've confirmed that it's on sale at all Tasmanian stores and likely to be nationwide. If not you can use my pics linked below to price match.
They're a good cheap alternative to the popular Xiaomi/Yeelight motion sensor lights and the Flat Night Light is good value as it comes with 3 AAA batteries.
I bought the exact one like the shared photo in Bunnings. The quality of the unit is excellent. Sensor is still working well after two years. Using 3 AAA batteries, the light is relatively bright. There is a magnet sticker that comes with it of which you can use to attach it to the right spot and easily remove the unit to change batteries. Fully charged batteries last a bit less than a month, averaging 10 to 15 activation per day. Cheers!