Basically copy coupon, view price history or create e-mail price alert. Let’s see what best price is ATM.
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):
Wattage: 1.8W, Built-in 2800mAh Li-ion battery, Noise: 31.5dB, Working time: 500h (1.8W lowest power), Package Contents: 1x Pillar (Motor), 1x Fan Component, 1x Base, 1x Blade Knob, 1x Fan Cover Knob, 1x Base Bolt, 1x Fan Cover Bolt, 1x Cable
Banggood
Banggood warehouse is located in China. I am tired of searching coupons, but I found one for you…
Link: Banggood product page
1. ($180.75): 427168
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
Price history (for all/most countries) for Xiaomi Floor Fan DC Frequency is here.
Price records source(s): Gearbest, 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)).