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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):
2 in 1 Sweep and Mop, Intelligent Route Planning, Three-dimensional Vacuum Cleaning System, APP Remote Control, 5200mAh Large Capacity Battery, 2000Pa Super Suction
Price history and price alert
Check out price history chart (for all/most countries) for Xiaomi Roborock S50 Vacuum Cleaner 2 EU Plug.
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)).