Just check coupons out (with price alert and history). What is best price?
[EU Direct] Proscenic F10 Pro Wet Dry Vacuum Cleaner Cordless and Vacuum Mop /3-in-1 Vacuum/Mop/Wash & One-Button Auto Self-Cleaning for Hard Floors /High-Capacity Dual Tanks /Edge Clean / Ease of Use
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in Europe 
. Sorry, but there’s no price history in my database.
Link: Banggood product page
1. ($214.99): BGF10PROPP
2. ($229.99): BGESJY8
apply code in your basket (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/5cd
Price history and price alert
It doesn’t make sense to generate price history chart, because there is one price record which is: $214.99.
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)).