Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (249.99 USD): BGBNK16
Coupon (312.99 USD): Email5
Coupon (312.99 USD): BGBNK10
(CouponsFromChina.com tip: paste coupon code in your cart and click Apply 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): BGBNK1, Wholesale20, BGBFCR28, BGBNK5, BGCITYADS2019, BGBNK6, BGBNK7, BGBNK8, BGBNK9, BGTT10, BGBNK11, BGBNK12, BGBNK13, BGBNK14, BGBNK15, BGBNK17
(there’s a little possibility that old coupon will work)
Price history and price alert
Price history (for all/most countries) for Binai G15 Pro J3160 8/256GB Notebook is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).