Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (53.99 USD): BGd7d34d
Coupon (57.79 USD): BG75597c
Coupon (61.87 USD): Cuponation9
Coupon (62.55 USD): BG8ReviTrage
Coupon (63.91 USD): BG00c906
(CouponsFromChina.com tip: you should apply the coupon 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): BGDEERMA1, BG10OFFAFF, BGwhielabel, 13f142, BG10OFFAFF1, BGHealth06, 00c906, BGHealth10D, BGeb72b1, 2022ACTIESNL, BGHB218, BG2a4121, 2203ActiesNL, BGHECARE1, BG5f513a, BG4ee866
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Price history and price alert
Price history (for all/most countries) for Deerma 25W UV Sterilizer Lamp is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).