Seems to be a glitch, but the $150 prepaid sim only data pack is $120 when you put it in your cart and checkout.
I've recently bought an iPad Cellular and was shocked at how much Telstra and Optus are charging to add the device to my existing plan.
Instead of the $15 per month ($180 per year) you can get this for $120 and it lasts 12 months.
My internet needs for this iPad will be limited so 40GBs will be ample for me.
Hope this helps someone in my position!
for $119 you can get 120GB with coles mobile plus any bonus weekly flybuys (i got 4000) and i think they still have 1000 flybuys