Aliexpress
Click here… to search for Xiaomi Roborock Xiaowa Lite C102-00 Robot Vacuum Cleaner on Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (149.99 USD): BGXWR
Coupon (215.99 USD): Wholesale20
(CouponsFromChina.com tip: apply it in your cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): adf930, EU1911428, f0f489, BGXRBC106, BGXW209, BGXW208, BGXMXW208, BG205XW, BGRSXW, BGRBXW102, BGRBXWMC
(these coupons are old, so probably won’t work)
Price history and price alert
Here is price history (for all/most countries) for Xiaomi Roborock Xiaowa Lite C102-00 Robot Vacuum Cleaner.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).