Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (12.99 USD): BG4ca4f7
Coupon (21.70 USD): BG00c906
(CouponsFromChina.com tip: apply it 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): BG9811bc, BGGines, BG2e2360, BGJUNEGSG9, BG54d54a, Cuponation9, BG8ReviTrage
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Price history (for all/most countries) for Modern Wooden Wood Digital Thermometer USB Charger Alarm Clock is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).