Go down and check coupons out. Remember to check price history if it is available. What is the best price?
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 code price check (UTC time):
Dust Box Capacity: 550ml, Suction Power: 150W, Suction: 26500Pa, Sweep, Vacuum, Cleaner Types: Vacuum Cleaner, Function: Suction, Voltage: 100-240V, Model: NEX2, Working Time: 70 minutes, Charging Time: 2.5 hours, Plug: CN Plug, Material: ABS + Metal
Banggood
Banggood warehouse is located in China. I am tired of searching coupons, but I found one for you…
Link: Banggood product page
1. ($612.93): 00c906
you should apply the coupon in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGRMNEX2, BGHOMEAPP, BGAFF7OFF, BGRNEX2, BGFRDHS, BGNEX2CZ, BGRMNEXA, BGHCLE15, BGSMRM2, BGRMN2, bgshOOp10, BGRMCNEX2, BGCZRMNEX2, BGHOMEAPP12, BGHome15%, BGCZRMNXE2, BGHOMEAPP13, BGCZDRDMEX, BGCZFRMFD, BGCZRMNESA, BGHOMEA13, BGCZRDMEX2, BGCZRMDN2, BGCZBFNEX2, BGCZRDMX2, BGHU0251, 7bcdf9, BGCZREMNEXD2, BGCZRDNEXC, BGCZRDEWN2, BGCZREMDC2, BGCZREMHY2, BGCZRDMN2, BG10OFFAFF, BGCZNEXD, BGwhielabel, BGCZENEX2, BGCZREMX2, BG10OFFAFF1, BANGGOODSD, BGapr26e, BGHzb16, BGAHPU13
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – Xiaomi ROIDMI NEX 2 Vacuum Cleaner [EU] ($-3)
Price history and price alert
Here is price history (for all/most countries) for Xiaomi ROIDMI NEX 2 Vacuum Cleaner.
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)).