BIG W seemed to have a sale on Fitbit products. Fitbit Sense which appears to be the flagship device was a claimed 40% off down to $299. A quick search online shows this is approx $100 off RRP.
For anyone interested it does everything every other fitbit does plus two extra things over the fitbit versa 3. ECG (heart rate monitor for abnormal beat and a stress indicator).
Comes in two colours, graphite or white.