Xiaomi Xiaoda USB UVC Ozone Sterilization Lamp [EU] (Banggood, Aliexpress: Function Portable & Mini, ZW2.5D8Y-02, Rated Power 2.5W, Size 141cmx 62cmx 52mm, ② Ion of Ozone, Formaldehyde+Ozone=Co2+H2O+Oxygen, UVC+Deep efficient adsorption, Battery 700mAh (Bulit-in) & Micro USB Charging, Color Black / White, 99.9& High Sterilization Rate & 30 Mins Effcient Sterilization, 360° No dead corner coverage, Model ZW2.5D8Y-01, Voltage DC 5V, Sterilization Method ① UV (the best price with coupon)).
Go down and check coupons out. Remember to check price history if it is available. You probably want to know what is the best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
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 Europe 
. Sorry, but there’s no price history in my database. There is one coupon available! Pretty cool, huh?
Link: Banggood product page
1. ($22.49): BGAFF10OFF
coupon code has to be applied in shop’s cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BFGUIER, BGHome15%, BGHOMEA15%, BGCuponation10, 13f142, BGHONEY2110, BANGGOODSD
(these codes were not working in latest coupon update, but you can check them out anyway)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – Xiaomi Xiaoda USB UVC Ozone Sterilization Lamp ($-3)
Price history and price alert
It doesn’t make sense to generate price history chart, because there is one price record which is: $21.99.
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)).