There is no official link to the offer from either Coles or Amaysim that I could locate, however I was doing a bit of shopping at coles today and noticed this great offer is back!
$25 per month ($8 for the $25 starter kit in store this week) gives you 22gb a month with a once off 28gb bonus upon activation along with an unlimited data banking as with Amaysim's standard offerings.
Important to note that if you change off this plan, you will be unable to return to it unless you buy a new starter kit and port out/back in.
Includes VoLTE/WiFi-Call as per all Optus MVNOs now but some have reported that you need to talk to Amaysim on live chat to enable it.
Offer ends on the 31st of Jan 2023
So bonus data is each month?