where to buy a portable oxygen concentrator?

Hi Tkluck, and thanks for posting this question - it's a good one. The vendors online can look quite similar - that is true.
You may want to speak with your physician about this - to help determine which particular concentrator will suit your condition best. This can depend on the flow rate you'll need, length of battery life, additional batteries, battery chargers, etc. Your physician should be able to assist you with specifications and choices. If the doctor is unable to help you, you may want to speak with your local medical equipment supplier - they usually have respiratory therapists on staff who should be able to guide you as well.
What do you think?
Leon (site moderator COPD.net)