I have some home oxygen bottles for sale in two sizes for sale. The larger size E (680 liters) are in good condition and priced at $10 each with a minimum purchase of three.
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The smaller oxygen bottles are size M6 (165 liters) and are excellent to new condition. These are the size that are commonly carried by people requiring oxygen. Priced at $20 each.
I have some oxygen bottle carts for hauling the size E bottles for $10 each, few valves for $15 each and some canvas bags for toting the M6 size bottles for $8 each.