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Since you may make mistakes in your initial foray into barbecuing, do not buy the expensive and high-end smoker. Instead, go for the commercial bbq smokers that has a bottom rack to produce fire and two higher racks to hold the food to be cooked. Also, there is a water pan to add moisture to the smoke and control the kind of smoke produced in these types of bbq smokers.
Buy a good water smoker to get good barbecued food at a low price. In most cases these smokers give excellent results if used judiciously. However, the very low cost ones may have issues with heat regulation.