According to my DB the lowest price is $84.63 for Instant Water Heater 220V 7500W Mini Electric Tankless Water Heater (in Banggood). You can create price alert here, copy coupons and view price history. You probably want to know what is the best price?
Instant Water Heater 220V 7500W Mini Electric Tankless Water Heater Wall-Mounted LED Display Support Thermostat Mode/Power Adjustment Mini Portable Instant Water Heater
Latest price update (UTC time):
Banggood ($84.63)
Banggood warehouse is located in China. Is it a reasonable price for this item? I have never seen better price than the current one in CouponsFromChina database, so it’s the best! There is one great coupon!
Link: Banggood product page
Price without coupon: $91.99
1. ($84.63): BGALL8
just apply this code in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
This is the best price ever noted in my database!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGBFDAY8, BGNEWYEAR8, BGSPRING8OFF, BGHONEYSP, BGESJY8
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Do you need price history chart (for all/most countries) for Instant Water Heater 220V 7500W Mini Electric Tankless Water Heater? There we go.
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)).