Xiaomi SWDK DD1 Electric Mop (Banggood, Aliexpress: Function: Sweep, Dirty Water Tank Capacity: 250 ml, Brand: SWDK(from XIAOMI YOUPIN), Charging Time: 3 hours, Working Time: 45 minutes, Roller Brush Speed: 380 ± 10% r/min, Model: DD1, Noise: ≤ 65dB, Battery Capacity: 2200mAh, Cleaning Areas: 120㎡, Cleaner Types: Floor Mop, Voltage: 110-240V, Water Tank Capacity: 400 ml, Battery Type: Li-ion battery, Material: ABS (the best price with coupon)).
You can create price alert here, copy coupons and view price history. Let’s see what best price is ATM.
Aliexpress
There’re some similar (or not) items on Aliexpress
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.
Link: Banggood product page
1. ($174.69): aff7off
2. ($174.69): bGpAnDacHeCk
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/5cd
Old coupons (from the oldest to the newest): BGSDK, BGSWWK
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
Check out price history chart (for all/most countries) for Xiaomi SWDK DD1 Electric Mop. The lowest price was: $158.99.
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)).