Power: 300W, Maximum Vacuum: 21000Pa, Maximum Suction: 100AW, Brand: Xiaoni Mijia, Working Time: Level 1 about 10min / Level 2 about 50min, Battery Type: Li-ion battery, Charging Time: 2.5h, Noise: ≤82dBA, Dust Bag Capacity: 400ml, Voltage: 110-240V, Battery Capacity: 5200mAh, Model: MJWXCQ06SZ.
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 price update (UTC time):
Banggood
Banggood warehouse is located in China. So I have checked for active coupons (all category coupons and old ones), but there was no working coupon in Banggood.
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGCNXMWH, BG10OFFAFF1, BANGGOODSD
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Price history (for all/most countries) for Xiaoni Mijia MJWXCQ06SZ Vacuum Cleaner 21000Pa is here. The lowest price was: $349.99.
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)).