Operating noise: ≤45dB, Oxygen pressure: 0.02-0.03MPa, combustion, Time setting: maximum., Speaker: 0.5W/80, Model: DE-1S, colorless gas, Rated voltage: AC220V, 110V, Oxygen generation method: Pressure Swing Adsorption(PSA), Power: 120W, Size: 340mmx185mmx305mm, Morphological identification: odorless, pH value: qualified according to the specified method, Ultra violet disinfection: 25 minutes timing, Oxygen concentration: 30%-90%(±3%)adjustable, Oxygen flow rate: 1-6L/min adjustable, Net weight: 6.3Kg.
Just check coupons out (with price alert and history). 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.
Link: Banggood product page
1. ($423.96): BG1efeb0
2. ($428.57): Terence
3. ($428.57): 2203ActiesNL
apply it in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
There were country-specific coupon codes published on Couponsfromchina social channels and price alerts. Coupon price may vary by country, because there’re different VAT rates, shipping cost etc. There is a chance that some latest coupons are still working:
Old coupons (from the oldest to the newest): BGdedakj1s, bGhOnEy10, 7d18f7, BGherra, BGSMOFF, Email5, BGELIG0920, BgcLuBofErtA10, BGPLTLEN, BGDDKJ3, BGCZOX, BGAFF10OFF, DEDAKJ1S, BGCuponation10, BGHONEY2110, BG7ae272, 7bcdf9, BGOxy10, BGd0b05d, 00c906, 2022ACTIESNL, BG3231fd, Tabby20
(you can check these old coupons out, but these probably won’t work)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – DE-1S 120W Oxygen Concentrator [EU] ($-3)
Price history and price alert
Do you need price history chart (for all/most countries) for DE-1S 120W Oxygen Concentrator? There we go. The lowest price was: $246.49.
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)).
. So I have checked for active coupons (all category coupons and old ones), but there was no working coupon in Banggood. I don’t know if this is a good price – number of records in my database is too low!