  Disposable party balloon tank.
You can buy these lightweight tanks of helium at Walmart or any party supply store. They are thin-walled steel, not like the heavy gas cylinders used in welding, and only contain enough helium for about 30 balloons. On the plus side, they come with a supply of balloons and ribbon, so you're all set to entertain the kids with elements (at 75 cents a pop, so to speak).
Source: Walmart
Contributor: Theodore Gray
Acquired: 7 August, 2002
Price: $20
Size: 18"
Purity: >90%
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