hey i have a volcano an they are awsome but it did cost me £300
i had a vapourizor i got off ebay its really good but you can tell its home made
basically its a small glass jar with a hole in the lid an put on a wooden base upside down
the hole int he lid houses a small halogen lamp which is the heat element
seems quit easy to make ya self an would cos less than 100 bucks il put some pics on here for ya to see how its made
its jus a very simple circuit that lights a bulb the woodenbase would be the hardest thing to make or find as it would need to fit the jar lid an be tight as a nuns cunt
i also would reccomend if you buy one that you get one that uses a halogen lamp and not a direct contact heat source like the blue meanie uses as that often charrs the weed so is pointless
the volcanos are defo worth the 600 bucks though trust me ive never been so stoned in my life an its a much nice buzz pluss you can still smoke ya vapourized weed afterwards an it still gets you stoned