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$4 Hot Air Balloon
Use a cheap painter's drop cloth and clear tape to make a real hot air balloon. It's even strong enough to fly a tiny digital camera.
In Flight from MAKE: schoolsout: School's Out page 70

$4 Hot Air Balloon
Up, up, and away, with Scotch tape and a painter’s drop cloth.
In DIY: Outdoors from MAKE: 29: DIY Superhuman page 134