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Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. I am tired of searching coupons, but I found one for you…
Link: Banggood product page
Coupon (21.77 USD): BG10OFFAFF1
(CouponsFromChina.com tip: apply it 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): f95007, db7afa, healthylifestyle, HHHHHOT, 502C6B, vipupgrade8, ML15%Pro, BGDouble11HC, BG11VIPD, BG9922, BGHHH2, BG22SP, bGhOnEy10, BGHMB7, bgshOOp10, BGHome15%, BGHOMEAPP13, BGHOMEA13, BGEWH99, 13f142, BGCuponation10, BG10OFFAFF, BGwhielabel
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
Price history (for all/most countries) for USB Electric Wood Humidifier Essential Oil Diffuser 130ml is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).