Material: Silicone, Type: AMOLED, Resolution: 360*360pixels, Bluetooth Version BT 5.0, Length: about 200mm, Battery Capacity: 390mAh, Width: about 22mm, Charging Type: Magnetic charging, Size: 1.3 Inch, Using time: About 20days, Standby Time: About 66days, Charging Time: About 2hours, GPS+GLONASS Support.
Just check coupons out (with price alert and history). 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 price update (UTC time):
Banggood
Banggood warehouse is located in China. There is one great coupon!
Link: Banggood product page
1. ($152.95): bgwp
apply code in your basket (cart) after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGTREX, BGTR132
(probably won’t work, but you can try them out)
Price history and price alert
Do you need price history chart (for all/most countries) for Xiaomi Amazfit T-Rex CN Smart Watch? There we go. The lowest price was: $129.99.
Price records source(s): 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)).