Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. There is one coupon available! Pretty cool, huh?
Link: Banggood product page
Coupon (10.99 USD): BGbc8747
(CouponsFromChina.com tip: apply code in your basket (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): BGAU11033, BGJUY195, BG10OFFAFF1, BANGGOODSD, 00c906, BG00c906, BGAlerabat1, Terence, Tabby20, 2203ActiesNL, BGHome15off, 8Couponsde, MVC8SPRING, BG09620e, BG229513, BGf4edd7
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Here is price history (for all/most countries) for LyRay 2 in 1 Mosquito Killer Lamp 1200mAh.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).