Xiaomi Mi Band 2 US$15.99 (~AU$21.06) @ Cafago (or ~AU$17.92 for New Accounts + Extra Steps)

Ship from China warehouse.

Edit: How to get it down to AU $17.92 (new accounts only):

1. Create new account (+ 100 points)
2. Subscribe to the newsletter in the new account (+ 100 points)
3. Upload picture in account (+ 20 points)
4. Add Mi Band 2 to Shopping Cart
5. Apply coupon code ZPA3642M
6. Redeem 220 points

Specifications:

Brand: Xiaomi
Color: Black
Battery capacity: 70mAh
The standby time: 20 days
Bluetooth: 4.0 BLE
Screen: 0.42" OLED
Body shell: Aluminum + PC
Waterproof rate: IP67
Adjustable wristband length: 155mm to 210mm
Subject size: 4.03 * 1.57 * 1.05cm / 1.6 * 0.6 * 0.4in
Subject weight: 7g / 0.2oz
Package size: 9.6 * 9.6 * 3.1cm / 3.7 * 3.7 * 1.2in
Package weight: 87g / 3.1oz