Battery powered air pumps are fairly inexpensive http://m.petsmart.com/h5/hub?id=http%3A%2F%2Fwww.petsmart.com%2Ffish%2Fair-pumps-air-stones%2Ftop-fin-battery-operated-aquarium-air-pump-zid36-5174805%2Fcat-36-catid-300087%3Fnull
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