You can create price alert here, copy coupons and view price history. Best price?
Touch Type Touch Panel, CPU MT6739, Memory RAM: 3G, ROM: 32G, Waterproof IP67 Waterproof (For washing hand or rain, but not for swimming or diving), Battery 3.7V / 600mAh, 1.25GHz, Screen Display 1.61in LCD Screen, Speed Quadcore, Screen Resolution 320*320 pixels
Aliexpress
I could not find it on Aliexpress. 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 coupon right now! Check this out.
Link: Banggood product page
1. ($177.90): BGc70579
put item in your cart and apply coupon code there 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): BGMRTICKS, BGOD1, AFfbG10, BGBFAFF2019, BGCITYADS2019, BGVDay10%off, BGAFF10OFF, BGTT10, bGhOnEy10, BGdragonBoat, BGSS10%SW, bgwp, Email5, band10, BGCuponation10, BGWRIBAND10, 6GSGIT, BG51f436
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Price history (for all/most countries) for JSBP X361 3/32GB Smart Watch is here.
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)).