How to make smokeless Bong?

I didn't see the film. Could they have been using an Iolite? It's a handheld piece that vaporizes bud rather than burns it; you turn it on and the heating element vapes the weed; you inhale it like an asthma inhaler sort of. It's a handy device, but it isn't cheap. We've talked and talked, using our Stoner's Ingenuity, trying to think of a way to do that on the cheap, and haven't done it.