Edit: This deal was supposed to be only valid for one day (18th May 2019), but I still could make a purchase with the code GOOD15 this morning (19th May 2019). So just give it a try, maybe you still can make the deal.
$8.46 for EIGHT 28-day renewals of AmaySim unlimited with 1Gb per 28-days mobile plan
● Get 1Gb every 28 days for each of the eight renewals
● Unlimited standard calls, texts and voicemails in Australia
● No lock-in contracts
● Keep existing mobile number or get a new one
● BYO mobile
● All AmaySim plans are powered by Optus 4G Plus network
● Price includes standard delivery of SIM card
● Redeem before 21st June 2019
By the way, you could try to link Shopback or Cashrewards with this purchase. You might get a few percent back.
Edit: I just received an email from Shopback that they've transferred $0.59 to my Shopback account. So it means $8.46 - $0.59 = $7.87 I paid for the last 8x28-days AmaySim deal. :-)
Bought two last nite for 19.90 plus cash rewards of 92 cents I think it was.. could have saved around 3 bucks..lol ..thanks for the posting though, might help others.