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Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
Heart Rate Monitor, Sleep Monitor, Sports Track, Call Remind, BLE 4.2, Waterproof: Yes, IP rating: IP65
Price history and price alert
Check out price history chart (for all/most countries) for Lenovo HW01 Smart Wristband [Fast-08].
Price records source(s): Gearbest
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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)).