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 (189.99 USD): BGTBR8HD
Coupon (233.23 USD): Email5
(CouponsFromChina.com tip: you should apply the coupon 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): 1B0G3R08, 1B2G3R08, 1B2G12R08, TECH8%, Wholesale20, BGBFCR03, BGTBR8, BGBFCR28, BGTBR9, BGCITYADS2019, BGTBZ1, BGTBR8X, BGTBR8C, BGTBR8K, BG5f76a5, BGTBR8F, BGTBR8D
(probably won’t work, but you can try them out)
Price history and price alert
Price history (for all/most countries) for T-bao Tbook R8 4/64GB Laptop Silver is here.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).