Just check coupons out (with price alert and history). What is best price?
RAM: 1GB, ROM: 16GB, Screen resolution: 400x 400, Screen size: 1.39 inch
Aliexpress
I could not find it on Aliexpress. Click here to search by yourself.
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Price history and price alert
Here is price history (for all/most countries) for TenFifteen S3 1/16GB Smartwatch.
Price records source(s): Gearbest
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)).