HUAWEI Band 3 Smartband (Banggood, Aliexpress: Bluetooth Version: Bluetooth 4.2, Battery Capacity: 100mAh, Standby time: 45 days, heart rate monitor, pedometer, sleeping monitors, 50 meters waterproof standard (the best price with coupon)).
Price history, coupons and price alert are available on this page. You probably want to know what is the best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in Hong Kong. There is one great coupon!
Link: Banggood product page
1. ($25.26): band10
you should apply the coupon in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): aff7off, 22honor, honor15, 21honor3, 502C6B, TTxBG10, BGhonor3E, BG3CSUM, AFfbG10, 0e7f33, BGCuponation10
(you can check these old coupons out, but these probably won’t work)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Hong Kong – HUAWEI Band 3 Smartband Blue ($-3)
Price history and price alert
Check out price history chart (for all/most countries) for HUAWEI Band 3 Smartband. The lowest price was: $12.99.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).