I've been waiting for this regular Vodafone half price offer at Woolworths on Ozbargain and finally found it myself at QV Melbourne.
Also on sale is Lebara 80gb 180 days for $50.
Edit: Now both are shown on Woolworths online catalogue:
https://www.woolworths.com.au/shop/catalogue#view=search&sal…
Don’t do it…. I left Telstra for the last 1/2 price Vodafone deal and have regretted it every single day since.