I can't comment on the cheapest part, but for me by far the easiest way to get CO2 is to find a supplier that will give you the tank already filled. When you need a new tank, you simply take the old one in and swap for another full tank. After the first tank, which requires a deposit, you will only pay the refill cost. By using this method you won't have to worry about getting your tank tested every so often (and probably before the first fill). From my experience, it is also much easier to find companies like Airgas that swap tanks than those that refill tanks. Who cares what the tank looks like? Chances are it will be tucked into your stand and out of sight anyhow.
Dave
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