On a side note, but somewhat related, I picked up a 20# CO2 tank yesterday for $50. Took it to my HBS today and traded it for at 20# NO2 tank and just paid the $25 for refill. Bought the N2 regulator for $75 and a N2 tap for $25.. plus some hops... a draft beer.. some tubing... and now I have a Nitrogen setup and it only cost me............................................. $234!

And I still keep telling my wife how I'm saving money! 20# of N2 should be good for a few years, though.