I wish Used Portable Oxygen Concentrator

I am in need of a small portable oxygen concentrator (like Inogen or similar). My pulmonologist prescribed one for me but the oxygen company I’m stuck with does not have any and don’t expect to have them soon, if ever. I can get the small tanks but they are so heavy. I’m on my own so with a tank and a cane, and purse if I can, it is difficult. I’m hoping someone may have one they no longer need and would be willing to part with. I would be so very grateful. Thank you

Grant Wish