Xiaomi Diiib Stainless Steel Kitchen Basin Sink Faucet (Banggood, Aliexpress: Type: Kitchen Faucet, Number of Handles: Single Handle, Hose Length: 600mm, Applicable Pressure: 0.05-0.75MPa, Connection Size: G1/2, Nozzle Thread Specification: M22, BubbLer: NEOPERL, Installation Type: Deck Mounted, Material: SUS304 Stainless Steel, Applicable Temperature: 4-90℃, Water Feature: Hot & Cold, Surface Finishing: Precision Wire Drawing (the best price with coupon)).
Basically copy coupon, view price history or create e-mail price alert. Best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($55.63): BG1efeb0
2. ($56.24): Terence
3. ($56.24): 2203ActiesNL
put item in your cart and apply coupon code there after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/feV
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
(there’s a little possibility that old coupon will work)
Price history and price alert
Price history (for all/most countries) for Xiaomi Diiib Stainless Steel Kitchen Basin Sink Faucet is here. The lowest price was: $37.49.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).