Aliexpress
Click here… to search for Digoo DG-TL280 Motion LED Night Light on 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 (4.99 USD): BG39TOL
Coupon (5.99 USD): BGAFF10OFF
Coupon (5.99 USD): bGhOnEy10
(CouponsFromChina.com tip: put item in your cart and apply coupon code there 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): 502C6B, 0404digoo, a005f9, e2bcea, vipupgrade8, TTxBG10, BGDigoo15%, AFfbG10, BG39AKW, BGTL280PL, BGTOLSF, BGTL2803, BG5131, BGTL28034, BGBFAFF2019, BGC2BB33, BGCITYADS2019, BGBAPOHG, BGVDay10%off, BGDG15
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
Price history (for all/most countries) for Digoo DG-TL280 Motion LED Night Light is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).