Better than nothing if you're gonna spend $500 or so with Amazon
"The first 3,000 orders who enter the promotional code “GIFTBFS15” in the “redeem a Gift Card or Promotional Code” box at checkout when purchasing $500 or more in Amazon.com.au Gift Cards in a single transaction will receive a $15 promotional credit that can be used on a future eligible order (“Offer”). Offer available between 12:01AM (AEST) on 20th November 2023 and 11:59PM (AEDT) on 3rd December 2023. Promotional credit will expire at 11:59PM (AEDT) on 30th November 2024. Your promotional credit will be automatically applied to your account within two (2) business days after your order is shipped (for physical gift cards) or the order being completed (for electronic gift cards). A confirmation email will be sent once the promotional code has been applied to your account. Your promotional credit can only be used for purchases of eligible items shipped and sold by Amazon AU and will be automatically applied during checkout. If a new Amazon.com.au account is created, it may take up to 48 hours for the promotional code to be successfully applied at checkout."