Aliexpress
Click here… to search for Xiaomi TIMEROLLS COB Watch on Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (49.70 USD): tRaDetRaCKeR
Coupon (49.70 USD): 8wEbgaInS5
Coupon (49.70 USD): pROMo8cuPoN
Coupon (50.24 USD): 2203ActiesNL
Coupon (50.78 USD): BG00c906
(CouponsFromChina.com tip: apply code in your basket (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): bgcob29, men15, AFfbG10, 502C6B, BGCITYADS2019, BGdragonBoat, BGSS10%SW, BgcLuBofErtA10, BGAFF10OFF, 13f142, BGHONEY2110, BGJWMEN15, BANGGOODSD, 00c906, ADMITAD2212, 2022ACTIESNL, Terence, Tabby20, BG1efeb0, MVC8SPRING, 8BGwbg2204
(there’s a little possibility that old coupon will work)
Price history and price alert
Check out price history chart (for all/most countries) for Xiaomi TIMEROLLS COB Watch.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).