Aliexpress
Click here… to search for T-BOOK X9S I5-8400 8/256GB GTX1050Ti Laptop on Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. We have found one coupon for this product!
Link: Banggood product page
Coupon (892.99 USD): affiliate6
(CouponsFromChina.com tip: coupon code has to be applied in shop’s cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Old coupons (from the oldest to the newest): BGTB717, aff7off, BGTB2706, BGTB22706
(there’s a little possibility that old coupon will work)
Price history and price alert
Price history (for all/most countries) for T-BOOK X9S I5-8400 8/256GB GTX1050Ti Laptop is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).