Net Weight: 7.3KG/14LB/222OZ, Atmospheric Pressure: 86kpa-106kpa, Rated Voltage: AC110V (US Plug)/AC220V (EU /UK Plug), Oxygen Flow: 2L-9L Adjustable, Display Control: HD LED Touch Screen, Machine Size: 33.8x 18.5x 30.5CM, Rated Power: 120VA, Operating Noise: ≤45dB(A), Oxygen Concentration: 30%-90% (±3%), Anion Output: 8 Million/cm³, Oxygen Generation Method: Pressure Swing Adsorption (PSA).
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Aliexpress
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Banggood
Banggood warehouse is located in Europe 
. Uhm… There’s no price history (in my database) for this product right now. I am tired of searching coupons, but I found one for you…
Link: Banggood product page
1. ($274.15): 8BGwbg2204
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/i1u
Price history and price alert
Price history is not available for this item (not enough database records)! The lowest price was $246.99 though.
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)).