Are you looking for the same thin crap or are you just thinking of the shape and use they have?
I'd have to load up a vacuum cleaner box full and weigh it.. But my guess is an arm and a leg.
I can only fit 4 at a time into a large flat-rate box.. snail mail (first-class) would be the way to go.

As long as there's peace in the world. Gimmie a break.