Battery Capacity: 3200mAh, APP Control: Yes, Voltage: 110-240V, Charging Time: about 4h, Suction Adjustment: 4mode, Battery Type: Li-ion battery, Power: 40W, Working Time: 110min, Self Recharging: Yes, Water Tank Capacity: 250ml, Suction: 2100Pa, Dust Box Capacity: 550ml, Brand: Xiaomi Mijia, Noise: 72dB, Climb Capability: 2cm, Model: 2C, Voice Control: Yes(Only supports Chinese version).
Just check coupons out (with price alert and history). You probably want to know what is the best price?
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 code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($323.99): BGwhielabel
2. ($329.99): BGCNXM2C
coupon code has to be applied in shop’s cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Price history and price alert
Check out price history chart (for all/most countries) for Xiaomi Mijia 2C Robot Vacuum Cleaner. The lowest price was: $323.99.
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)).