Power 1.5 W – 2W, Light Time 1 Hours By Default, Weight 151g, Timing Function 2 – 8 Hours, Spray Time 4 Hours By Default, Water Shortage Power Off Protection Yes, Application <10㎡, Input Interface DC3.5, Power Support USB Charge, Color Transparent, Rate Voltage DC 5V - 1A, Size, Capacity 160ml Max., Humidifying Capacity 30ml/h, Noise <36db, Shape Cactus, 80x 80x 139mm. Price history, coupons and price alert are available on this page. Best price?
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 found coupon for you. Check this out.
Link: Banggood product page
1. ($17.56): BGBF20off2
paste coupon code in your cart and click Apply after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
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
(there’s a little possibility that old coupon will work)
Price history and price alert
Do you need price history chart (for all/most countries) for XIAOMI SOTHING 319 Cactus Humidifier? There we go. The lowest price was: $7.99.
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)).