Saw this offer under my Westpac rewards section. Likely targeted.
No profit but with those deals drying up, hopefully someone will find it useful. Safe to combine with Shopback/Cashrewards.
T&Cs:
"Get $30 cashback when you spend $50 or more at Boost Mobile.
Spend $50 or more in a single transaction on your Westpac Credit Card by either the primary or secondary cardholder. Limited to 1 cashback transaction(s). Cashback is limited to 1 card per customer, per retailer and will be paid into your account within approximately 7 days. Offer is valid for online purchases only. Offer cannot be used in conjunction with any other offer. Offer cannot be refunded, exchanged, transferred or redeemed for cash."
$35 cashback on the $35 SIM via TopCashback