Ronald, check with a couple of independent plumbing supply houses in your area. Make sure that at least one of these is near an upscale housing area. Actually go into their store so they can't put you off as easily as on the phone, but plan to let them take care of the professional plumbers first if they just have a counter and not a showroom.
If they have a counter, then talk to the oldest, grumpiest guy there. He'll find one for you. There is a reason that the oldest, grumpiest guy is still there and that's because he knows how to find the tough items.