Aliexpress
Click here… to search for 360 S7 Robot Vacuum Cleaner on Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in Hong Kong. One coupon is available. Cool!
Link: Banggood product page
Coupon (450.00 USD): 7bcdf9
(CouponsFromChina.com tip: coupon code has to be applied in shop’s 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): BG360S7, BGN360S7, bgshOOp10, BGAFF7OFF, BGHOMEAPP13, BGHOMEA13, BG11SHOP
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
Here is price history (for all/most countries) for 360 S7 Robot Vacuum Cleaner.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).