Xiaomi Yunmi 1500W 6L Tank Electric Water Heater (Banggood, Aliexpress: Rated Pressure: 0.75mpa, Certification: FCC CE ROHS, Size: 240x 250x 365mm, Rated Power: 1500W, Heating Mode: Single Pipe Heating, Capacity: 6L, Max Heating Temperature: 65℃, Waterproof Grade: IPX4, Color: White, Energy Efficiency Rate: Level 2, Inner Container Material: Enamel (the best price with coupon)).
Basically copy coupon, view price history or create e-mail price alert. Let’s see what best price is ATM.
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($82.40): BGBK15
2. ($82.40): BGSMOFF
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 and https://couponsfromchina.com/short/feV
Old coupons (from the oldest to the newest): BGBAK15, bGhOnEy10, BGSM15
(probably won’t work, but you can try them out)
Price history and price alert
Check out price history chart (for all/most countries) for Xiaomi Yunmi 1500W 6L Tank Electric Water Heater. The lowest price was: $81.59.
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)).