I built an extra 30 button c/g Anglo concertina that I will be sending to a juried craftsperson competition this month. I thought perhaps I would trade it for a flute when the competition is completed.
Both my wife and daughter are playing the concertina now, better than I! So I have been assigned the flute players position in our little ceili band.
You might contact some of the makers directly. Several of them make nice 6-key flutes for that ball park give or take a bit. I know Copley is in that range.
Also, Grey Larsen, a noted concertina player and fluter, sells flutes on his website with no waiting period. He may have something and be interested in a swap. In any event Grey is connected to both the serious flute players and the serious concertina players. He may be a good resource. Check out his website for an email address.