Just bought a Copeland low D from someone on the board, and am having a ball with it. It plays both registers easily, with an especially rich and almost reedy low register. The only trouble is the high-high D note, but that is a tricky note anyway, and not often needed.
I showed my new toy to a friend (flute and whistle player, and maker of simply outstanding Native American flutes) and he is majorly jealous 
If anyone here has another used Copeland low D that they would like to sell, you might want to drop a line to Eric Marczak : epm03@hotmail.com Be sure to put something about a Copeland low D in the subject line so he doesnât trash your mail as SPAM, and tell him I sent you.
You might want to consider a trade for one of his flutes as payment⌠I have a double barrel NA flute with the âchanterâ tuned diatonically as a whistle which is outrageous.
Thom Larson from thewhistleshop.com let me play his Copeland sterling silver low D once. Man! 
Paul, stop wasting your hard-earned money on verdigris-prone competitors.
Make your own conical, resonant, wooden low D.
I volunteer to help you testing the prototype* 
- Esp. since thereâs strictly no news about that bear I told shouldnât be hastily skinned, remember?
These have always been the
best low Ds, for me, anyhow.
Nothing short of death could make me part with mine. It is an outstanding whistle.
My favourite low D ..and I keep on telling people how much I love Overtons so thatâs really saying something.
Now Paul, you expect to find two of those going secondhand in a couple of weeks? Well, you never know.
I sold mine a few years for a fundraiser at my daughterâs school. I still have my Copeland Low F. But I do miss the big boy.
Dale
Mineâs for keeps too. Even my daughterâs flute teacher rates it 
.
Trisha