Aliexpress
Click here… to search for Xiaomi 3life Mosquito Killer Lamp on Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. One coupon is available. Cool!
Link: Banggood product page
Coupon (30.07 USD): BANGGOODSD
(CouponsFromChina.com tip: just apply this code in your cart 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): BGL398, TTxBG10, BG153LIFE, aff7off, AFfbG10, BGJISU55, 502C6B, BGSWAT15, BGBFAFF2019, BGCITYADS2019, BGBGHFRI15, 0e7f33, BG30HE, FBCOUPON1, BGHome15%, BGHOMEA15%, BGAFF10OFF, BGCuponation10, 13f142, BGHONEY2110, BG10OFFAFF, BGwhielabel, BG10OFFAFF1
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Do you need price history chart (for all/most countries) for Xiaomi 3life Mosquito Killer Lamp? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).