Help me buy a portable oxygen machine

I had got diagnosed with spinal tb as a child which left me with scoliosis and permanently compromised my lungs because my chest doesn’t receive enough air because of my back.

Since then I’ve had to back to back terrible lung infections and lung failures inbetween 

My last lung failure was caused by clots that developed in my lungs as a result, my lungs don’t get enough oxygen but I’m still recovering from that as a result I take chronic medication that help prevent the clots and help with my lung function.

The amount of medical bills including a lot of money I spend on chronic medication on a month to month basis is crazy and I cannot really afford to rent the portable oxygen anymore which usually helps me move around or allows me to keep it around when I’m on set or out of the house for safety purposes or even travel for jobs outside of Joburg because I can’t really fly without it. 

The oxygen costs a lot to rent it and that it seems just cheaper and better to just buy it which I can’t really afford. There are cheaper machines but they’...