Aliexpress
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Here are coupons that you can use.
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – Xiaomi Roborock S6 Robot Vacuum Cleaner [EU] (-3 USD)
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in Hong Kong. You can get coupon down below.
Link: Banggood product page
Coupon (593.99 USD): BG10OFFAFF1
(CouponsFromChina.com tip: paste coupon code in your cart and click Apply 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): BGRKBTS6, aff7off, BGXM529, BGHKRS6, BGAFF7OFF, BGRBHS6, bgshOOp10, BGHKS6R, BGHRBS6, BGHOMEAPP13, BGHKS6RBC, BGHOMEA13, BGCZRBCS6, BGS6bianco, BGCZWBFS6, BGCZRBDS6, BGCZRCWHS6, BGCZPRRBS6, BGHKRSGBS6, BGCZFDEWYUS, BGCZSPRSD6, 7bcdf9, BGHKSRES6, BG10OFFAFF, BGwhielabel, BGCZWSDS6, BANGGOODSD, BGCZBFS6, BGCZRBS6, BGCZFRS6, ADMITAD2212
(I don’t think these’re gonna work, but you can try ’em out anyway)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – Xiaomi Roborock S6 Robot Vacuum Cleaner [EU] (-3 USD)
Price history and price alert
Price history (for all/most countries) for Xiaomi Roborock S6 Robot Vacuum Cleaner is here.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).