Aliexpress
Click here… to search for Xiaomi DYT-90 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. I couldn’t find any coupon for this product on latest product update.
Link: Banggood product page
Price: -3 USD
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): 3628ea, e2bcea, TTxBG10, BGOD1, 2019SPEDM, AFfbG10, 0e7f33, BGTS204, FBCOUPON1, BGTRIP01, BGZPBC15, BGTY704CP, BGCuponation10, BGHONEY2110, BG10OFFAFF, BGwhielabel, 13f142, BG10OFFAFF1, BG4d9120, BGAlerabatod, BGAlerabatdo, 00c906, BG00c906, BGe46870
(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 DYT-90 Mosquito Killer Lamp? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).