Ruth's Portable Oxygen O2 Machine

I'm Ruth's husband John, looking for help. Ruth and I will be celebrating our 49th year as a married couple this Jan 24. Ruth and I are living at 8,000 ft altitude and the air is clean but thin. Ruth is 82 years old and still loving life. Moving to a lower altitude would not help been there tried that.  Ruth has been on oxygen part time for about 5 years, it's now gotten to the point where Ruth's on it 24/7. Ruth's been lugging around an 5 pound oxygen cilinder and she just would love to lighten her own load. There's a portable oxyger generator on the market right now that is only about 2.8, doesn't sound like much, but when your 82 it's a big deal hauling something around all day. S.S. is our only sorce of income, I'm telling your where on a fixed budget, no bull. This O2 machine is available right now and could be here within days of ordering. So could you please help me, help my partner lighten her load. Thanks for giving it some thought John.