I tried to get this previous deal before it expired 31/3/2020 - https://www.ozbargain.com.au/node/519409 - but it seems gone now.
However, in the sign-up, I noticed there was a small text box, halfway down the options stating 120GB (80 + 40GB) @ $150 for new customers. Recharge customers remain at 80GB. I took a screenshot as I just ordered just in case.
Mods, if this is not a new deal, please remove. I have a $2 Boost sim, but seems I have to order from Boost to get the deal. If you're looking at porting or work no longer paying for your mobile, this is a good option. Expiry not mentioned.