In fact, Italian threaded bottom brackets have been of the endangered species lists for over a decade, and I'd be surprised if most shops today made the fairly large investment in a pair of Italian threaded taps.

I might also note that re-tapping a thread with a damaged lead (first thread or two) is far more difficult than tapping a virgin thread. Normally to re-tap such a thread we start from the good end (ie, the back of the crank for a damaged pedal thread) allowing the tap to follow the old thread and extend it over the bad thread. This isn't an option with a bottom bracket.

In order for the new threads to perfectly mesh with the remaining good thread they both have to be phased identically. Unless there's enough good thread in the damaged section that you can reliably pick it up, you run the risk that the tap begin cutting out of phase and then follows that lead destroying the existing thread. The right way to do the job is to clean out the damaged section as a counter-bore so you can pick up the lead of the undamaged thread immediately.

So, since anyone who knows the proper way to do the job, and since only a thread or two is damaged, I suggest that you forgo retapping entirely and carefully file or Dremel away the worst damaged areas until you can get the cup to engage the remaining good threads. If more than two or three threads are damaged The job becomes much more complex and I suggest you carefully qualify whoever you bring it to because otherwise the odds are more than 50/50 that they'll do more harm than good.