Ends TODAY.
It's actually a $40 sim. I had to activate by chat and found there are two options - 45gb/28 days or 10gb/42 days. The latter works out to be cheaper than boost with the same 6.67gb/month data. No international / no telstra network though.
I'm using it to hop out of my 12 months boost before I port back in (better than paying $150/yr).
Seems to be an unmentioned part of this deal: https://www.ozbargain.com.au/node/521547