There used to be 2 kinds of portable oxygen. One is regular like you use and the other is liquid. The liquid you can refill at home. My mom got freaked by the liquid, because the big tank boiled dry and it upset her so she went back to the concentrator (what you are calling a compressor). You ought to be able to talk to your oxygen provider and get more info. If you go from one system to the other, I don't think there should be much cost, but it's been 20 years since mom was on it. There are tank stands to mount on wheelchairs and again your supplier ought to be able to get one for you, but that would be for the tall tanks or there are the separate wheeled stands, but I think it would be too hard to juggle it was for us. If you can get the smaller ones you can just hang it off the wheelchair handles or make a soft cloth bag to hang over the handles (between them). Good luck with what ever you decide, let us know how it goes.