Lenovo Cardio Plus HX03W Smartband (Banggood, Aliexpress: Bluetooth 4.2 Heart Rate / Sleep Monitor IP68 Waterproof (the best price with coupon)).
Check coupons or create price alert down below. You probably want to know what is the best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. Only one coupon available!
Link: Banggood product page
1. ($18.38): BGAFF10OFF
put item in your cart and apply coupon code there after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/feV
Old coupons (from the oldest to the newest): 502C6B, pllenovo, TTxBG10, band10, BG03W, 10lenovo, BGHX03, 2019SPEDM, AFfbG10, BGHX03W2, BGBFAFF2019, BGPro19, BGLENOVO20, BGVDay10%off, BGband10
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Price history and price alert
Here is price history (for all/most countries) for Lenovo Cardio Plus HX03W Smartband. The lowest price was: $9.99.
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)).