This one started today, but I went into my Optus App to get it and there was a 50% off data sim offer that stacked with the $0 Tablet.
Has to be 30gb data plan or above.
So my deal was
$12.50 x 12 Months
Tab A8 64gb 4G
30 GB Data added to my data pool
$150 total cost.
although they said they will update, my estimated next payment is still showing $56.54
I'm going to check optus webchat soon again