Just check coupons out (with price alert and history). You probably want to know what is the best price?
Compatible systems: Android 4.4 and above, Charging mode: back clip type 3-point charging, Chip: Switzerland-Nrf51802 Microprocessor ;, Charging time: about 2h, 20 days of standby, Vibration: Silence / Vibration, Battery capacity: 90mAh, iOS 9.0 and above, Life time: 10 days of use, Blood pressure heart rate sensor: Epco-EM7028, Battery type: polymer lithium battery, Waterproof level: IP67, Three-axis sensor: Bosch-BMA220
Aliexpress
I could not find it on Aliexpress. Click here to search by yourself.
Here are coupons that you can use.
Latest coupon and price update (UTC):
Price history and price alert
Price history (for all/most countries) for Gocomma C1PLUS Smart Bracelet is here.
Price records source(s): Gearbest
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)).