Aliexpress
Click here… to search for Xiaomi Diiib Shower Head & Hose Black on Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. I can’t find any active coupons for this product in Banggood.
Link: Banggood product page
Price: -3 USD
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): 502C6B, HHC15, vipupgrade8, alibuy3439, Faucet12, 3493f9, TTxBG10, BG2646, BG2281, BG2756, AFfbG10, BGBFCR43, BGCITYADS2019, BG6613, BGVDay10%off, BG7589, bGhOnEy10, BGYJ001, bgshOOp10, BgoFErTaSchInA10, BgcLuBofErtA10, BGAFF10OFF, 13f142, BGCuponation10, BGHONEY2110
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
Here is price history (for all/most countries) for Xiaomi Diiib Shower Head & Hose Black.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).