Aliexpress
Here are coupons that you can use.
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – Xiaomi 500G Enhanced Water Purifier [EU] (-3 USD)
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (404.09 USD): BG10OFFAFF
Coupon (439.99 USD): 7bcdf9
(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): BG500GEH, BGXM500G, BGSS10%SW, bGhOnEy10, bgshOOp10, BGHome15%, BGHOMEAPP13, BGMR532CZ, BGHU0136, BGHOMEA13, BGCuponation10
(there’s a little possibility that old coupon will work)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – Xiaomi 500G Enhanced Water Purifier [EU] (-3 USD)
Price history and price alert
Price history (for all/most countries) for Xiaomi 500G Enhanced Water Purifier is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).