Depending on application needed you may need a high end regulator for controlling co2 such as the ma957 or an economy single gauge one. Regulators , Acetylene, o2, Welding, Racing

Co2-Cylinders  offers regulators for every possible tank. 

New for the 2007 line a great selection of beverage regulators for beer and wine, various cylinder regulators for medium and heavy duty applications and multi-purpose fixed and adjustable piston regulators for just about every other application possible.
Looking to Party well check out the Helium Ballon inflators.