Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. There is one great coupon!
Link: Banggood product page
Coupon (460.99 USD): 13f142
(CouponsFromChina.com tip: 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
Old coupons (from the oldest to the newest): Email5, 7d18f7, BGCENAI4, BGCENAI5, BGCEN02, BGCENAI6
(these coupons are old, so probably won’t work)
Price history and price alert
Do you need price history chart (for all/most countries) for CENAVA F158G 15.6inch i3-6157U 8/512GB Notebook? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).