I got one for a 100.00 at the local head shop. It is a black box with a digital thermostat. It was the best money I have ever spent. Your stuff lasts longer,less smell and I believe that smoking with it reduces the amount of bad toxins you inhale.
One word of advice, if you have not smoked threw one take it easy the first time. You don't see smoke like a bong or pipe and if your not careful you will over do it. lol
be cool