Just check coupons out (with price alert and history). You probably want to know what is the 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):
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~
Banggood
Banggood warehouse is located in China. Only one coupon available!
Link: Banggood product page
1. ($260.94): BGHB218
this code has to be applied 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
(there’s a little possibility that old coupon will 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)).