Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in Hong Kong. You can get coupon down below.
Link: Banggood product page
Coupon (499.99 USD): BG8e0a64
(CouponsFromChina.com tip: paste coupon code in your cart and click Apply 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): 13f142, BG5e39ab, BGa1d2c7, BG7EBMN10, BGe0f3dd, BG7MN17, BG953697, BGaac3e1, BG5f1803, BG9a0a95, BG204d86, BG83df3c, BG1b5c17, BGfc0b3e, BGa2965a, BGc889ed, BG3f4510, BG592eae, BG4aee27, BG058949, BGb189d0, BGb3e8f3, BG788f3e, BGGRTB48K, BG7fffdb, BG56f755, BG356dc1, BGMNPCX23, BG3fe738, 00c906, BG4a2dd9, BG4c75a4, 2022ACTIESNL, Tabby20, BG9c3be7, BG6e4150, 2203ActiesNL, BGd827ae
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Do you need price history chart (for all/most countries) for T-BAO TBOOK MN48H Ryzen 7 4800H 16/512GB Mini PC? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).