Charging Time: About 2 hours, Heart Rate Monitor Support, Using time: About 7-10 days, Waterproof IP68, Multi-sport Mode Support / Build-in 20 sports, Blood Oxygen Monitor Support, Model MAGIC 3, Charging Method: Magnetic, Type: TFT, Battery Capacity: 220mAh, CPU nRF52840, Brand KOSPET, Standby Time: About 35 days, Pixel: 280*320, bluetooth Version BT 5.0, Size: 1.71 inch.
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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.
Link: Banggood product page
1. ($46.91): BGc70579
2. ($46.91): BGbf11dd
coupon code has to be applied in shop’s 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): BGMAGIC3, band10, BGEEUKOSPET, BGKPMG3, BG833a30, BGKOPMG3, BGaa8131, BG770359, BG20177f, BG51f436, BG390b08, BG305434, BGde249f, BGbda786, BG343102, BG83c8e9, BGad8fc0, BGfd149b
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
Price history (for all/most countries) for KOSPET Magic 3 Smart Watch is here. The lowest price was: $19.99.
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)).