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 (55.63 USD): BG1efeb0
Coupon (56.24 USD): Terence
Coupon (56.24 USD): 2203ActiesNL
(CouponsFromChina.com tip: just apply this code 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): BG4604, 502C6B, AFfbG10, BGdbfaucet, BGBFCR43, BGCITYADS2019, BGVDay10%off, BGHOMEG12, BG7589, bGhOnEy10, BGYJ001, bgshOOp10, BGHWDEALS888, BgoFErTaSchInA10, BgcLuBofErtA10, 7d18f7, BGCuponation10, 13f142, BGHONEY2110, BG2accfd, BANGGOODSD, ADMITAD2212, 2022ACTIESNL, Tabby20
(probably won’t work, but you can try them out)
Price history and price alert
Price history (for all/most countries) for Xiaomi Diiib Stainless Steel Kitchen Basin Sink Faucet is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).