Just check coupons out (with price alert and history). Do you want to know what the best price is?
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
1 pcx Mop, 1 pcx Roller Brush, 2 pcsx HEPA Filter, 2 pcsx Side Brushes
Price history and price alert
Price history (for all/most countries) for Alfawise V10 Max Robot Vacuum Cleaner Accessories Kit is here.
Price records source(s): Gearbest
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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)).