Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (18.13 USD): band10
Coupon (19.14 USD): 13f142
(CouponsFromChina.com tip: apply it in your cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): 502C6B, BRANDXS, AFfbG10, BGVDay10%off, BGXXANES, BGCuponation10
(these coupons are old, so probably won’t work)
Price history and price alert
Price history (for all/most countries) for XANES M30 Smart Bracelet Black is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).