[microtherion]

They keep most of their inventory uninflated so storage requirements are not that big and the designs keep a long time, and for non-specialists, it's generally not worth keeping bottled Helium around, so it's a pretty decent business I suppose.

[pnutjam]

I buy my inflated balloons at the "dollar store", which is a good deal since they are 3.99 or more at the grocery store.