Aliexpress
Here are coupons that you can use.
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – Xiaomi Xiaoda USB UVC Ozone Sterilization Lamp (-3 USD)
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in Europe 
. There’s only 1 record in my database, so I have no idea if the price is OK. One coupon is available. Cool!
Link: Banggood product page
Coupon (22.49 USD): BGAFF10OFF
(CouponsFromChina.com tip: paste coupon code in your cart and click Apply 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): BFGUIER, BGHome15%, BGHOMEA15%, BGCuponation10, 13f142, BGHONEY2110, BANGGOODSD
(system checks these coupons on every price check (like once per 24 hours), 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 USD)
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 USD.
You can set price alert (for Banggood).