CO2 Needle Valves

I've got the CO2 bottle, I've got a good regulator. Now I need to
find a reasonably priced needle valve. The really precise ones are called
micrometer needle valves but the price range is well over a $100 ea.

I haven't been able to find the ARO model N01 which is mentioned in the
FAQ. Does anyone have a number for ARO supplier who could get me the
name of a local distributor here in Vancouver? Or can anyone recommend
an alternative needle valve? What are folks using on their compressed
CO2 injection systems?

Steve   in drizzly Vancouver (but the sun peeks out occasionally :-)