...some co-ops have Italian BB taps ( ours does, I bought them myself) but it's anybody's guess depending on where you live.

A lot of the actual, for profit bike shops are not real interested in doing this sort of stuff any more; too time consuming for the rewards. If you have a frame maker within reasonable distance, that might be your best bet, but basically you are gonna have to do some calling around if you want to do the ream and tap to Italian thing. I'm still looking for a fixed reamer tool to do this, but we'll probably have to continue using an adjustable one, with the hazards that can entail.