Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (18.91 USD): Cuponation9
Coupon (19.12 USD): BG8ReviTrage
Coupon (19.53 USD): BG00c906
(CouponsFromChina.com tip: put item in your cart and apply coupon code there 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): BGCVFan99, bGhOnEy10, BGdragonBoat, BGSS10%SW, bgshOOp10, BGHome15%, BGHOMEA15%, BgcLuBofErtA10, BGAFF10OFF, BGCuponation10, 13f142, BGHONEY2110, BGAPWEEK616, BG10OFFAFF, BGwhielabel, BGSXFR616, BGJUFO616, BGis616, BGPDhome29, BGJUSE616, BGTYOC616, BGTYC616, BGIOC616, BGSPHOME23, BGBF20off2, 00c906, BGAlerabat1, Terence, Tabby20, 2203ActiesNL, BG1efeb0, 8Couponsde, MVC8SPRING, 8BGwbg2204, tRaDetRaCKeR, 8wEbgaInS5, pROMo8cuPoN, BG4d17f1, BGJUNEGSG9
(these coupons are old, so probably won’t work)
Price history and price alert
Do you need price history chart (for all/most countries) for Xiaomi VH Portable Fan? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).