Spotted on page 12 of the catalogue
Spend $1,000 or more using your Zip Pay or Zip Money Account at JB Hi-Fi to earn $100 cashback. Cashback redeemable when you hit the Rewards Goal. Promotion limited to one redemption per customer. Excludes gift cards. Promotion starts at
8am3pm AEST on 24 December 2022 and ends 11.59pm AEST on 1 January 2023. Rewards Program T&Cs apply.
Credits to hamza and anonymous poster
Much easier to just get 10% off GC.