You get what you pay for.
I have a Volcano I got from the company that makes it, ordered it C.O.D online for $539. Comes with a 3 year warranty too.
I love it more than a lot of things.
Only worry about either that, or the Super Vapezilla. Everything else just won't be as primo, period.
A vaporizer is basically a super duper smoking device that just heats up and blows hot air through the bud which just takes the THC out of it and put it into whatever the air's blowing into (a bag on my volcano, everything else is like just a tube.) It makes schwag taste like primo/hashish, and it's real potent. Not to mention the fact that it's pretty much harmless and won't stink the place up.
I LOVE the Volcano, worth every dollar. You can be chillin' alone and use like, not even a bowl pack of reggie and just get fuckin' blazed.