There are generally the chain DMEs, such as Lincare and Apria. I believe there's a DME called Roberts something, with two or three in the area; I believed my brother used that one. And check the yellow pages for medical equipment providers. I've not used any of them personally, but at least you can call around and ask your questions.
You might consider contacting some of the AWAKE support groups in the Washington, D.C. metro area, even if outside of the city. They might give you some local pointers. You can find a list of the AWAKE support groups in the ASAA's main website
www.sleepapnea.org.
Linda
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