Just check coupons out (with price alert and history). What is best price?
Weight 800g, Color Tarnish / Misty Gray, Rated Power 14000W, Brand XIAOMI, Executive Standard GB 4706.1-2005 GB4706.15-2008 GB4343.1-2018 GB17625.1-2012, Size 114.6×75.9×252.1mm (Without Air Nozzle), Model H900, Rated Frequency 50Hz, Rated Voltage 220V~
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):
Banggood
Banggood warehouse is located in China. You can get coupon down below.
Link: Banggood product page
1. ($260.94): BGHB218
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 and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGHealth10D
(these coupons are old, so probably won’t work)
Price history and price alert
Here is price history (for all/most countries) for Xiaomi MIJIA H900 Hair Dryer.
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)).