On sale for the cheapest price yet and beating my own previous Banggood deal is the popular Xiaomi Mi Band 6. This is the Chinese version, but the only difference from the Global version is that the packaging is in Chinese instead of English. The hardware and all other features remain the same.
The improvements over the Mi Band 5 is a larger 1.56" 152x486 AMOLED display (was 1.1") , SpO2 sensor (was China only) and 30 sport modes (was 11).
Other features include over 130 watch faces, heart rate monitoring, sleep monitoring, 14 day battery life, 50m water resistance, magnetic charging and more. It works with apps including Mi Fit, Google Fit and Xiaomi Wear.
1 order per customer, free shipping and AU$ based on current Mastercard rate.
Hekka.com is a more new Chinese store and I checked with reps from BG, GB etc. and they've heard of them. Worst case you'll have PayPal on your side.
Fake won't work with the Xiaomi app. If it pairs with the app then it's genuine.
I'd say Hekka disposed of the packaging to simply save on postage costs.