Before going on holiday this year I contacted the better know suppliers of oxygen and was quoted $700/800 for rental on an oxygen concentrator for 2 weeks.
I researched a bit on the internet and found a company in Kissimmee. I contacted them and found them to really helpful, to the extent that they arranged to deliver the machine to where I was staying, at no extra charge.
They also arranged to collect the machine at a location where it was convienient for me to leave it on my way back to the airport.
heir charge for two week was $200.
The machine they gave me was fairly new, fairly quiet, and at a weight that we could lift it into the car as we moved from location to location.
I highly recommend this company called Burkley Oxygen Services and will be happy to provide their email address if anyone is interested.