Portable oxygen machine

I am looking to raise money for a portable oxygen machine. My mother is stage 4 colon cancer. She also has copd. In order for her to be able to travel, to visit family, so see the places she wants to see before her passing. She needs one of these. My father is retired military and he stays home to take take care of her, so there's not a lot of extra for them to be able to afford one on their own. Tricare does not cover this unfortunately. I want her to have the best quality life, for however long that may be. Please help me reach my goal.