Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (559.99 USD): BGSF702
Coupon (669.59 USD): aff7off
Coupon (699.99 USD): Wholesale20
(CouponsFromChina.com tip: apply it in your cart 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): BGSF314, TECH8%, BGSF408, BGSF55, BGSF625, BGSF653
(these coupons are old, so probably won’t work)
Price history and price alert
Here is price history (for all/most countries) for Acer SF314 i5-8250H 8/16GB/2TB Laptop.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).