All previous posters (starflyte1, phefferon, rickg, folksarenuts, rn1tv):
Whether you are still using oxygen or are getting rid of your O2 concentrator, I hope that you are aware of The Villages Airheads, A COPD Support Group, whose members use and are deeply familiar with O2 equipment.
I am VP of this group and we can help you in almost any and every way, whether it be finding a new pulmonologist, new equipment or disposing of either!
I'm happy to accept your PM.
SWR