Similar to this deal - https://www.ozbargain.com.au/node/228045 however they're Panasonic branded, not Sanyo.
Navigate to the oo.com.au website using the incognito function in your browser to be offered a further $10 off for new members - minimum spend $50
Not the cheapest they've been, however due to Santa delivering heaps of toys for the kids that require batteries, this deal will have to do.
Tried in both incognito and not incognito. Price is still $24 each or $72 for 3. And delivery remains free.
I think you are referring to the $10 off your first order. Which won't apply as soon as you login if you've already used it.