Just check coupons out (with price alert and history). Do you want to know what the best price is?
Superior purification, Negative oxygen ion, Aromatherapy function, Super silent design, Replaceable filter
Aliexpress
I could not find it on Aliexpress. Click here to search by yourself.
Here are coupons that you can use.
Latest coupon and price update (UTC):
Price history and price alert
Check out price history chart (for all/most countries) for TenFifteen Desktop Air Purifier.
Price records source(s): Gearbest
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)).