Kevin, I think it is worth asking you what your priorities are as you embark on exploring smoking and what sort of talents you have. Some here have mentioned making your own smoker out of a 55 gallon drum. That is great if you are handy, have the right tools, and have perhaps more time than money to get it done. Others have mentioned the idea of getting the best smoker you can afford. That makes sense if you know you want to continue with the pursuit, because more expensive smokers generally hold a temperature better and longer and hold more food.
I would suggest that you start by modifying whatever equipment you have and use that.If you have been using charcoal then perhaps you have a Weber kettle. If you do then as mentioned there are many ways of getting great results from your kettle. Googling "Weber kettle smoker conversion" will give you an endless supply of links showing various strategies for the task.
So, tell us a little bit more about what equipment you've got, how much you want to spend, what you think you want to do with it, etc. All that information will help us to make suggestions that work for you and your needs.
I for one will caution you right out of the gate about buying an inexpensive side firebox style smoker, which is what the Char Griller is. While with patience, experience, and a few modifications it can turn out bbq as good as any other, it can be a challenge. Someone once said "more people have been turned off of smoking by buying cheap SFB smokers than for any other reason" and I would tend to agree. They can be recalcitrant and frustrating beasts.