Look in the yellow pages (or google) for 'aviation support services' near airports that handle small planes.
There is probably a shop there that has the bigger oxygen concentrators that refill tanks like that for the aircraft that use them.
ETA: Most welding gas shops only do tank swaps instead of filling personally owned tanks.
You can buy a tank just like the ones they use but most weld gas shops will only take that from you and give you one of theirs of the same size in a swap then you wind up owning that tank.
Oh , and tanks need to be inspected, pressure tested and certified as safe for transport on US highways every ten years I think.
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The Zombie Apocalypse is Upon Us.
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