Aliexpress
Click here… to search for Xiaomi Laptop Portable Stand on Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. There is one great coupon!
Link: Banggood product page
Coupon (18.60 USD): BG00c906
(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): TTxBG10, AFfbG10, affbg10, BGBFCR29, BGCITYADS2019, BGVDay10%off, BGMPB2020, BGAFF10OFF, bGhOnEy10, BGdragonBoat, BGSS10%SW, BGGRLS, bgshOOp10, BgoFErTaSchInA10, BgcLuBofErtA10, BGGRM26, BGCuponation10, 13f142, BGHONEY2110, BGMI89, BGMI226, BANGGOODSD, 6GSGIT, 00c906, BGef96eb, Kortings10, 2022ACTIESNL, Terence, Tabby20, 2203ActiesNL, BG1efeb0, 8Couponsde, MVC8SPRING, 8BGwbg2204, 8wEbgaInS5, pROMo8cuPoN
(these coupons are old, so probably won’t work)
Price history and price alert
Price history (for all/most countries) for Xiaomi Laptop Portable Stand is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).