Just check coupons out (with price alert and history). What is best price?
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 and price update (UTC):
Run Time: 60mins, Power: 435W, Suction Power: 135AW, Charging Time: 2.5h, Noise: 75dB, Model: F8 Pro, Voltage: 100-240V, Vacuum Degree: 23500Pa, Dust Cup Capacity: 0.4L, Color: White, Rotating Speed: 110000rpm
Banggood
Banggood warehouse is located in China. There is one coupon available! Pretty cool, huh?
Link: Banggood product page
1. ($441.04): 00c906
you should apply the coupon in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGHOMEAPP13, BGHOMEA13, BGCZRDMF8U, BGCZREDFP8, BGCZF8PR, BGCZEMF8P, 7bcdf9, BG10OFFAFF, BGCZRDMG8, BGwhielabel, BG10OFFAFF1, BANGGOODSD
(there’s a little possibility that old coupon will work)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – Xiaomi ROIDMI F8 Pro Vacuum Cleaner [EU] ($-3)
Price history and price alert
Here is price history (for all/most countries) for Xiaomi ROIDMI F8 Pro Vacuum Cleaner.
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)).