Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. You can get coupon down below.
Link: Banggood product page
Coupon (359.99 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): BGX8SP2, aff7off, BGTBX8P, BGTBX8K, BGBFCR28, BGTBX9K, BGCITYADS2019, BGTBX8SA, BGTBX9D, BGTBH1, BGTBH2
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Here is price history (for all/most countries) for T-bao Tbook X8S Pro i3-5005U 8/256GB Laptop.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).