You'll get it cheapest if you buy it used from Craigslist or a pawn shop or something then just have it filled locally. Just make sure the hydrostatic test date was in the last 5 years or you'll have to pay extra for the test.
Also, if you're using Airgas, call them ahead of time to make sure they actually have the tank you want to fill in stock. Mine doesn't carry the 10 pound tank, for example, so I had to have it filled somewhere and couldn't just have it swapped out by Airgas or a local welding supply company.
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 Cardinal Rule
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