Plug: CN, Voltage: 220V – 240V, Flow Range: 1-5L/min, Model: YU300, Oxygen Concentration: 30%-94%;, Material: ABS.
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 Europe 
. I don’t want to misguide you about the price. I don’t know if it’s good, because I don’t have enough records in my database… I found coupon for you. Check this out.
Link: Banggood product page
1. ($209.99): BGCZYWXMG
this code has to be applied in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGYWHX, BGHOMEAPP, BGXMYWS, BGYWXM, BGYW300XM, BGXMYU300, BGYWRA, BGYUW35, 7bcdf9, BGRFTEA, bGhOnEy10, BGYWUB3, bgshOOp10, BGHome15%, BGHOMEAPP13, BGCNYWELL, BGCNYWLLP, BGHOMEA13, BGCNYUPU3, BGCDC082, BGCNMEXUY, BGHU0314
(there’s a little possibility that old coupon will work)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – Xiaomi YUWELL Home Oxygen Concentrator Machine ($-3)
Price history and price alert
Well, you won’t see price history chart, coz we have only 1 database record for this item (and price was $209.99).
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)).