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I would keep an eye on ebay for a little while, something always comes up. I've purchased two tanks so far on ebay, one was $35 with a regulator, the other $50 without regulator (aluminum tank). Needle valve and adapter was around $20 with shipping. So if you have the patience to wait for a good deal, you'll certainly find one. I fell asleep waiting for a recent co2 setup to end and it was sold for $55 complete with diffuser and bubble counter.

My local fire extinguisher store also sells new and used cylinders quite cheap and a regulator can be purchased for around $15-20 on ebay.

Hope that helps
Giancarlo Podio
 

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Personally I prefer to own my own cylinder, the one I purchased on ebay was a hospital grade tank which everyone seems to admire when I take it to get refilled :) But for some purposes, tanks can be filled with CO2 and oil or other elements depending on the purpose, that's why I prefer not to swap mine for another. And you never have to buy a new one, we have a 20lb tank that has been tested and re-stamped several times, it's no big deal really. Some fire extinguisher service centers can do it on premises and will give you the tank back the next day. Obviously when you buy a used tank it's always wise to ask what date is stamed on the tank, this will tell you how long before you need to have it tested again.

Giancarlo Podio
 
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