Went through a refund process with School Locker in the past and found this New Balance offer in their service/help centre portal. They had a 40% off code last year valid until October 1st 2024 which worked and now they have another for 30% off.
Basically fill in your edu.au email account into the form to get a 30% discount code in your email after ~24hrs.
No idea if the same email address works periodically, but I used a "named" (john.doe @edu.au) email address last year and then used the university ID (u1234567 @edu.au) email address for the current one and I got another discount code.
Terms & Conditions are listed in their webpage.
Excludes clearance, discount & e-gift products, Cricket Equipment, Made in USA/UK Products, collabs, 52WK styles* and clearance items. Further exclusions may apply.