Aliexpress
Click here… to search for Ulefone Power 3S 4/64GB Black on Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in Hong Kong. We have found one coupon for this product!
Link: Banggood product page
Coupon (122.99 USD): Email5
(CouponsFromChina.com tip: apply code in your basket (cart) after clicking “Proceed to checkout”. Click to copy code and open shop)
Old coupons (from the oldest to the newest): od7off, BGBFAFF2019, BGCITYADS2019
(these coupons are old, so probably won’t work)
Price history and price alert
Check out price history chart (for all/most countries) for Ulefone Power 3S 4/64GB Black.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).