You can create price alert here, copy coupons and view price history. Do you want to know what the best price is?
Power (W): 38, Voltage (V): 34, Noise (dB): 48.4
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. I found coupon for you. Check this out.
Link: Banggood product page
1. ($210.62): 00c906
coupon code has to be applied in shop’s cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): d1382f, PICODICOM, 715556, Wholesale20, bgssaff9, BGaDmITAd, BGBFAFF2019, BGCITYADS2019, BG9NY, BGXMFTR, BGHOMEAPP, BGSTCJ, BGTT10, bGhOnEy10, 7bcdf9, BGSS10%SW, bgshOOp10, BGHome15%, BGHOMEAPP13, BGCJJSQ01ZM, BGJSQ01ZM, BGHOMEA13, BGAHUM11, BGCDC026, BGCJJSQ01, BG21CJJSQ01ZM, BGCuponation10, BG01ZM4CZ, BG10OFFAFF, BGwhielabel, BGACZSM, BG10OFFAFF1, BGcba346, BGb48b1a, 6GSGIT, BG4dd22e, BGBFD42, BG4ea24e, BGHUA12
(there’s a little possibility that old coupon will work)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – Xiaomi Humidifier CJJSQ01ZM [EU] ($-3)
Price history and price alert
Check out price history chart (for all/most countries) for Xiaomi Humidifier CJJSQ01ZM.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).