For some you might be able to use $15 off Minimum $39 Eligible Spend (for Prime Trial Account Users Who Made No Purchases in Last 12 Months) too. Expired.
Rosewood, $159: https://www.amazon.com.au/dp/B085LFG2XQ?smid=ANEGB3WVEVKZB
Not the lowest price, but as OfficeWorks has pushed its Fitbit Charge 4 prices back up to
$247 (now at $178), you can get OW to price beat the Rosewood colour option to $151.05, which is a pretty decent price. The Storm Blue colour is higher at $178: https://www.amazon.com.au/gp/product/B086GNY129?smid=ANEGB3WVEVKZB
It is at the same price at Harvey Norman. So one can get OW to price beat to $169.10. Price updated, see below EDITs.
EDIT 13/04 PM:
The Black colour option & Special Edition Black Woven are now also at $178. Expired.
Black: https://www.amazon.com.au/dp/B085M5SXVS?smid=ANEGB3WVEVKZB (Price Beat at OW to get $169.10)
Special Edition: https://www.amazon.com.au/dp/B085LFGCBW?smid=ANEGB3WVEVKZB
EDIT 06/05 AM:
Rosewood colour option back down to $159, likely price matching Myer: https://www.myer.com.au/p/fitbit-fitbit-charge-4-advanced-fi...
Black is at $174.95: https://www.amazon.com.au/dp/B085M5SXVS?smid=ANEGB3WVEVKZB
Storm Blue is at $175.99: https://www.amazon.com.au/gp/product/B086GNY129?smid=ANEGB3W...
PriceBeat at OW for extra 5% off: https://www.officeworks.com.au/shop/officeworks/c/technology...