Aliexpress
Click here… to search for Xigmer Lunar X01 Smart Watch on Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in Hong Kong.
Link: Banggood product page
Coupon (38.22 USD): BGbf11dd
Coupon (38.22 USD): BGc70579
(CouponsFromChina.com tip: coupon code has to be applied in shop’s cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Old coupons (from the oldest to the newest): BGXIGMER, band10, BGWRIBAND10, BGdd1298, 6GSGIT, BG93eba7
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Price history and price alert
Here is price history (for all/most countries) for Xigmer Lunar X01 Smart Watch.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).