Size: 177.5*54*330mm, Material: ABS, Rated Power: 0.65W, Voltage: DC5V 1A, Wavelenghth: 360nm-400nm.
Go down and check coupons out. Remember to check price history if it is available. Best price?
Aliexpress
I could not find it on Aliexpress. Click here to search by yourself.
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. There is one coupon available! Pretty cool, huh?
Link: Banggood product page
1. ($36.62): BG10OFFAFF1
paste coupon code in your cart and click Apply after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGYEELIGHT88, BGYEELIGHT5555, TTxBG10, BGHealth2, ML15%Pro, vipupgrade8, BGYeelight6, AFfbG10, BGYEE11COU, bGpAnDacHeCk, 2020CNY, BGbeauty001, bgshOOp10, BGHB20, BgoFErTaSchInA10, BGYEE20COUPON, BGSD52147, BgcLuBofErtA10, BGYEE2021, BGCuponation10, BGYEEL10, BG10OFFAFF, BGwhielabel, BGLIG12
(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 Yeelight Mosquito Swatter Killer Lamp? There we go. The lowest price was: $24.99.
Price records source(s): Gearbest, 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)).