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 (799.99 USD): BG3dc77f
Coupon (1692.79 USD): BGBFDAY8
(CouponsFromChina.com tip: apply code in your basket (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): BG4c51f0, BG717000, BGd8d5af, BGMARCHSALE, BG589b2e, BG89e932, BGAUGUST8, BG703a15, BGaa91af, BG8e0480, BGCAPITALOS8
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Price history (for all/most countries) for GPD WIN Max 2 16GB 1TB R7 6800U Notebook 10.1 Inch is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).