Just check coupons out (with price alert and history). You probably want to know what is the best price?
Application Area Less Than 20 ㎡, Power 5W, Black, Model 603, Power Cable Length 1.5 m, Frequency 50Hz, Weight 370g, Rate Voltage 5V, Material Plastic, Size 11x 10x 19 cm, Color White
Aliexpress
I could not find it 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. I couldn’t find any coupon for this product on latest product update.
Link: Banggood product page
Price: $-3
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 and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): 135a02, vipupgrade8, f79746, TTxBG10, BGss8%hl, bgssaff9, AFfbG10, 502C6B, BGBFAFF2019, BGCITYADS2019, BGBGHFRI15, BGHOMEG12, BGMPB2020, BGAFF10OFF, bGhOnEy10, BGdragonBoat, bgshOOp10, BGHome15%, BGHOMEA15%, BgcLuBofErtA10, BGXPDE01, BGAFF7OFF, 13f142, BGCuponation10, BGMA3105, BGHONEY2110, BG10OFFAFF, BGwhielabel, BGJUY054, BGXPDC39, BG10OFFAFF1, BANGGOODSD
(there’s a little possibility that old coupon will work)
Price history and price alert
Here is price history (for all/most countries) for Loskii-603 Anti-Mosquito Lamp.
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)).