It depends what you want.
Common 9oz through 20oz CO2 bottles cost less than $20 each online. They are always shipped empty, and they cost $3-$6 to refill. They are good for five years then they will need to be hydrotested, with the exception of 9oz, or any bottle with a diameter smaller than two inches.
Compressed air gas bottles, on the other hand, cost significantly more. Cheap, low pressure steel bottles cost as low as $35, where high end, high pressure carbon fiber bottles cost up to $190.
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