where to buy portable oxygen

{"cid":"91215259","title":"Factory hospital cylinder price backpack with mask for sale medical sizes for diving portable oxygen tanks","imgUrl":"https:\/\/img.chinax.com\/nimg\/9e\/e7\/28cdcb1bd93527cc33dde540e3e8-200x200-1.jpg","attrs":{"Price":"$80.00\/pieces 10-99 pieces","Brand Name":"Saferlife","Model Number":"OXY4LS","Minimum Order Quantity":"10 pieces","Pressure":"High","Place of Origin":"Guangdong, China","Material":"Steel","Use":"Medical Gas","Marerial":"Alloy steel","Test Pressure":"22.5MPa","Working Pressure":"15MPa","Water Capacity":"4L","Certification":"CE","Weight":"6KG","Port":"Guangzhou","Supply Ability":"10000 Roll\/Rolls per Month"}}

{"cid":"91206681","title":"Smart Portable Dissolved O2 Meter Stainless Steel Dissolved Oxygen Probe","imgUrl":"https:\/\/img.chinax.com\/nimg\/d5\/07\/124f9a4ea5c2a586e560617079b5-200x200-1.jpg","attrs":{"Price":"$280.00 - $400.00\/ Piece","Brand Name":"Desun Uniwill","Model Number":"DYS-1","Minimum Order Quantity":"1 pcs","Delivery Time":"7~ 15 working days","Certification":"CE","Place of Origin":"China","Payment Terms":"L\/C, D\/A, D\/P, T\/T, Western Union, MoneyGram","Supply Ability":"0~1000 pcs","Packaging Details":"Carton packaging","DO Range":"0~20mg\/L or 0~200%","DO Accuracy":"1%","Sensor Material":"Stainless Steel\/Titanium","Temp. Range":"0~40\u2103","Temp. Accuracy":"\u00b10.2\u2103","Measuring Distance":"3m~5m","Working Temperature":"-20\u2103~50\u2103","Power":"<0.5w","Signal Output":"RS-485"}}