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 (13.99 USD): BG39fefb
Coupon (29.42 USD): Cuponation9
(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): BGSHO07336, 13f142, BGBUYWITHUSDDB, BGCuponation10, BGHONEY2110, BG3d4c6f, BANGGOODSD, ADMITAD2212, 2022ACTIESNL, Terence, 2203ActiesNL, BG1efeb0, MVC8SPRING, 8BGwbg2204, tRaDetRaCKeR, 8wEbgaInS5, pROMo8cuPoN, BGFAUCET8, hoNEYbGdeAlS, BGJUNEGSG9, BG456b35, BG716a66
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Do you need price history chart (for all/most countries) for Diiib Dechlorination Booster Shower Head? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).