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Does anyone know somewhere (ideally online) I can buy plastic air ducting?

The stuff I'm talking about is what they used on Mythbusters to make that helium 'airship'. It's just a large diameter tube made of thin plastic (polythene), used in places like movie sets and with other temporary structures.

This is it: http://www.tombling.com/ducting/sizes.htm but this company only supplies to trade and doesn't sell directly.

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