Compatible OS Android 4.4 or above, Bluetooth Version BT 5.0, APP Name F FIT, Model S30, Charging Type: Magnetic charging, Customized Watch Face Support, Size: 1.3inch, Using time: About 7 days, Battery Capacity: 360mAh, iOS 9.0 or above, Operating Mode Full Touch+Press Button, Waterproof IP68, Resolution: 240*240pixels, Band Size: about 212*22mm, Standby Time: About 60 days, Charging Time: About 2 hours, Dial Size: about 47*47*13mm, Type: TFT, Product Weight: about 48g.
Basically copy coupon, view price history or create e-mail price alert. 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 coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. Well, there is one coupon available right now.
Link: Banggood product page
1. ($32.12): BGc70579
this code has to be applied in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/i1u
Old coupons (from the oldest to the newest): BGSEN30, BGSS10%SW, 13f142, BGPLS30, BG2SEN30, band10, BGWRIBAND10, 6GSGIT, BG51f436
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – SENBONO S30 Fitness Tracker [EU] ($-3)
Price history and price alert
Here is price history (for all/most countries) for SENBONO S30 Fitness Tracker. The lowest price was: $17.99.
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)).
. There’s only 1 record in my database, so I have no idea if the price is OK.