Xiaomi Mijia MJSTS1 Pro Robot Vacuum Cleaner (Banggood, Aliexpress: 2 in 1 Dust Box Water Tank: 260ml(Water Tank)+300ml(Dust Box), Suction Adjustment: 3gear, Voice Control: Only Supports Chinese, Power: 42W, Water Volume Adjustment: 3gear, Battery Capacity: 5200mAh, Brand: Xiaomi Mijia, Wireless Connections: Wi-Fi IEEE 802.11b/g/n 2.4GHz, Suction: 4000Pa, Host Model: MJSTS1, Dust Box Capacity: 550ml, Application Area: 250m², APP Control: Yes, CMIIT ID: 2021DP0745, Battery Type: Li-ion battery, Voltage: 100-240V 50/60Hz 0.8A, Charging Base Model: CDZS1 (the best price with coupon)).
Basically copy coupon, view price history or create e-mail price alert. Let’s see what best price is ATM.
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. One coupon is available. Cool!
Link: Banggood product page
1. ($599.99): BGCNXMPU
this code has to be applied in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/feV
Old coupons (from the oldest to the newest): BGCNXMPRM, 7bcdf9, BG10OFFAFF, BGCNXMSPR, BGCNNEWXM, BGwhielabel, BGCNXMP, BGCNXMUPA, BGCZXMSTP, BG10OFFAFF1, BGHU0775, BGCZXMPRE, BGCNXMSR, BGCZTAXMP, BGCZXMPR5, BGCZXMPT, BGDUXMCPR, BGCZBFXMP, BGBFCZMP, BGCZPLMP, BGCZPLXMPE, BGCZPLXMPV, BG49c64a, BGIT202203, BGGR2202, BGIT2222, BGHU1708, BGc03d95, BG64a506, BG4a9f05, Terence, BGDC0304, BG1dfbbc, BGcabddf, MVC8SPRING, BGf6521b, BGb8a9e8, BGmiproB, BGmiproA, BG622yb29, BGPLXMPU, BGjune30d, BGmiproDYF08, BGjuly12e, BGxiaomipro
(these coupons are old, so probably won’t work)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – Xiaomi Mijia MJSTS1 Pro Robot Vacuum Cleaner [EU] ($-3)
Price history and price alert
Price history (for all/most countries) for Xiaomi Mijia MJSTS1 Pro Robot Vacuum Cleaner is here. The lowest price was: $479.99.
Price records source(s): Banggood
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)).