The beer supply stores also rent them (or they used to at least). It actually works out pretty well if you're not having to refill often. You basically get to keep the tank for as long as you want on a charge and then pay a bit extra when you refill. I looked into it several years ago when I was setting up a FW planted tank. (I was ready to do it and then stumbled across a good deal on a used 10 pounder.)
I bought my 5# bottle from a homebrewery store for $74 , cheaper than I found even on ebay after you figure in shipping. We also sell some 20# where I work for $150 but I'm not sure the grade on those.
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