Just check coupons out (with price alert and history). 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):
Package Contents: 1x Robot Vacuum, 1x CN Plug Adapter, 1x Charging Dock, 1x Water Tank, 1x Mopping Pad, 1x English User Manual
Price history and price alert
Do you need price history chart (for all/most countries) for Xiaomi Roborock S50 Robot Vacuum Cleaner [HK]? There we go.
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)).