Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. There is one great coupon!
Link: Banggood product page
Coupon (242.77 USD): BANGGOODSD
(CouponsFromChina.com tip: this code has to be applied 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): BGCNWSDECR, BGHOMEA13, 7bcdf9, BG10OFFAFF, BGwhielabel, BGCNWERC, BGCNWECD, BG10OFFAFF1
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Do you need price history chart (for all/most countries) for WS-1080 Window Cleaning Robot? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).