ORIGINAL: Greg / MO
Bawanajim, Cabela's has them. For some reason, Bass Pro doesn't.
They come in white and a flo orange in case you're in snow... I just got the orange so I wouldn't have to worry about anything. You pull out an extremely small puff of cotton-like material, and you can watch it forever as it floats through the woods. I bet one (cost of like $7 or so) would last you YEARS.
Greg thanks ,What a way to learn thermals while in a stand. Great idea.