Aliexpress
Click here… to search for XIAOMI SOTHING 319 Cactus Humidifier on Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. There is one great coupon!
Link: Banggood product page
Coupon (17.56 USD): BGBF20off2
(CouponsFromChina.com tip: just apply this code 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): 502C6B, PICODICOM, 098468, BG319HM, 2133CPO, AFfbG10, BGKT30GR, BG319KT, BGBFAFF2019, BGCITYADS2019, 13f142, BGVDay10%off, BGHOMEG12, BGAFF7OFF, BGAFF10OFF, bGhOnEy10, BGSOTHING25, BGLKZZVVDC54, bgshOOp10, BGHome15%, BGHOMEA15%, BgcLuBofErtA10, BGCuponation10, BGHONEY2110, BG10OFFAFF, BGwhielabel, BG10OFFAFF1, BANGGOODSD
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Do you need price history chart (for all/most countries) for XIAOMI SOTHING 319 Cactus Humidifier? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).