Go down and check coupons out. Remember to check price history if it is available. Let’s see what best price is ATM.
Built-in chip type: Nordic 51822, Bluetooth Version: Bluetooth 4.0, Screen size: 0.96 inch, Battery Capacity: 90mAh
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):
Banggood
Banggood warehouse is located in China. There is one coupon available! Pretty cool, huh?
Link: Banggood product page
1. ($25.54): band10
this code has to be applied in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGMG4, 2019SPEDM, BG3CSUM, BGMGCOOL4, AFfbG10, 0e7f33, FBCOUPON1
(these coupons are old, so probably won’t work)
Price history and price alert
Here is price history (for all/most countries) for MGCOOL Band 4 Fitness Tracker.
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)).