I have just checked coupons. The lowest price I could get is 15.99 USD for Mirror LED (in Banggood). You can create price alert here, copy coupons and view price history. What is the best price?
Latest coupon code price check (UTC time):
Banggood (15.99 USD)
Banggood warehouse is located in China. So I have checked for active coupons (all category coupons and old ones), but there was no working coupon in Banggood. Price? Well, this price is higher than average price (9.78 USD)
Link: Banggood product page
Price: 15.99 USD
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BGRU023, 502C6B, 0404digoo, 24DGDE, vipupgrade8, TTxBG10, aff7off, AFfbG10, BGDGDM1, BGBFAFF2019, BGCITYADS2019, BGTY2K, BGVDay10%off, BGDG15, BGdigoo15, BGAFF10OFF, BGTT10, 20%DG422, bGhOnEy10, BGdragonBoat, BGSS10%SW, BGDGASG, BGHome15%, BGHOMEA15%, BGOCFO023, BgcLuBofErtA10, BGNOTD023, 13f142, BGHBHJ105, BGCuponation10, BG10OFFAFF, BGwhielabel, BG10OFFAFF1, BANGGOODSD, 6GSGIT, 00c906, BG00c906, BGAlerabat1, BGf625a4, BG589b2e, BGc4a05f
(probably won’t work, but you can try them out)
Aliexpress
Click here… to search for Digoo DG-DM1 Mirror LED Alarm Clock on Aliexpress
Here are coupons that you can use.
Price history and price alert
Here is price history (for all/most countries) for Digoo DG-DM1 Mirror LED Alarm Clock.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).