I use a regulator similar to this one.
https://www.amazon.com/SKYTOU-Regula...%2C218&sr=8-11
My tank I picked up off of craigslist from someone getting out of home brewing. More than likely you aren't going to be able to buy a filled tank online but you can get empty ones. When getting the first tank from places like airgas the initial amount is going to be higher because you have to buy the tank. Subsequent refills are much cheaper. Don't buy a fancy pretty tank because most of the time when you need a refill your tank will get swapped for a prefilled one with a newer certification.
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