Lowes now sells a portable CO2 regulator for paintball tanks:

http://www.lowes.com/lowes/lkn?actio...735-J-6901-100

For $90 (plus a paintball tank you have to supply?) you get
regulated CO2 on a 10-foot hose with quick-connect fitting.
Meant for running air tools from your belt, but looks like
it would work fine for beverage applications.

Anyone tried it or looked at it?