My dad is coming to visit and he has to be on oxygen 24/7. He has a portable concentrator but would like a regular concentrator for night time. Does anyone have any information on this? I had one place in POP that had ONE concentrator and it was broken. They were cheap and would have only charged me $100 USD for 12 days. OXA wants $50 USD a DAY for one. Does anyone else know of any other rental companies or ideas? It would be much appreciated.