Basically copy coupon, view price history or create e-mail price alert. What is best price?
Product name: FIVE Intelligent Disinfection Lamp, Bactericidal factor: UV disinfection lamp, Rated input: 220V ~ 50Hz, Product model: YSXDD001YS, Use area: 20m² ~ 30m², Support system: Android4.4 or iOS9.0 and abovexiao, Rated power: 35W
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 China.
Link: Banggood product page
1. ($89.33): BGHB218
2. ($98.78): BG00c906
you should apply the coupon in your 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): BGLIGHT2020, BGXMFIVE, bGhOnEy10, BGTT10, BGSS10%SW, BGdragonBoat, BGDL52, BgoFErTaSchInA10, BGELIG0920, BgcLuBofErtA10, 4bca6e, BGAFF10OFF, BGCuponation10, 13f142, BGHONEY2110, BG10OFFAFF, BGwhielabel, BGc30aee, BG10OFFAFF1, BG53c70e, BANGGOODSD, BGHealth06, 00c906, BGHealth10D, 2022ACTIESNL, BGfd37d7
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Do you need price history chart (for all/most countries) for Xiaomi FIVE Disinfection Lamp? There we go.
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)).