Received a paper insert from Optus. Looks like a good deal. Target has this for 259$.
Specs:- https://www.optus.com.au/shop/prepaidmobile/oppo/a73/black.
This is for 4G Samsung J5 Pro $239 ( was $299)
One use codes
https://ibb.co/gRO1yn
https://ibb.co/guyZJn
You will need to scan a barcode to redeem this offer. The barcode is usable twice (thanks Hasher) and can be obtained by procuring an Optus promo flyer at a Optus Shop.
These flyers have a unique barcode. You need to bring in the flyer to the Optus store and they scan it or you won't get 20% off their prepaid range.