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…
Nice, i wonder if the 12 month Lebara sims are on special also. When you search Lebara on the woolies website dont get any results at all.