Long time user, first time poster.
Olympus is having a "10% Cashback" promotion on all orders over $1000 at participating AU and NZ retailers. between 18 October – 24 October 2021. Cashback claims can be submitted to Olympus until 14 November, 2021.
Digidirect has some Olympus lenses at 15% off already, so combined with the 10% cashback, you can get 25% back. Possibly even stack with Shopback for 27.8% off total