Tank Capacity 130ML, Weight 220g, Size 147*100mm, Voltage DC 5V, Power 3W, Application Indoor Area About 31~40㎡, Time Setting 2-8 Hours, Noise <36dB. Go down and check coupons out. Remember to check price history if it is available. Let’s see what best price is ATM.
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. I am tired of searching coupons, but I found one for you…
Link: Banggood product page
1. ($21.77): BG10OFFAFF1
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/i1u
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
(these coupons are old, so probably won’t work)
Price history and price alert
Here is price history (for all/most countries) for USB Electric Wood Humidifier Essential Oil Diffuser 130ml. The lowest price was: $5.99.
Price records source(s): 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)).