Aliexpress
There’re some similar items on Aliexpress in my database. There may be some other items though.
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Price history and price alert
Here is price history (for all/most countries) for Xiaomi Mi Band 2 International [HK].
Price records source(s): Gearbest
Click on image to enlarge.
You can set price alert (for Banggood).