If you're buying a used one, always test it before you buy it. You don't need to back a bowl of shisha or anything, just fill the base with water, put it together (hand over where the bowl would be) and draw in through the hose (or just the hose port) and make sure it bubbles. If it does, buy the sucker and go on your way. Worldhookah.com has really cheap Khalil Mamoon's (if you're up to the lambourgini of hookahs for an all time low price... prob lowest you'll ever find 'em). You can also get a pumpkin hookah for really cheap on ebay if you search for it.