I am offering a used Burke DBSBT whistle, made 07/2008, which i acquired when i lost my first DBSBT, but luckily someone found it and returned it 
.
Beautiful tone, very good condition.
It has the internal plastic lined barrel with O-rings for easy tuning and taking apart.
I am also offering a self-made second brass whistle body tuned in C,
to make it a combo whistle.
Total price £120 plus postage.
Or £100 for the D whistle alone, without extra C body.
I can offer extra brass bodies for £20 each in keys of Eb, D, C#, C and B.
Note that the playing characteristics change a little with different keys.
I find the DBSBT plays best with D, C# and C bodies.
It plays nice and bright with an Eb body,
it plays a bit softer with a B body.
Playing with an E body is possible too, but much more demanding.
And playing with a Bb body is possible as well, but it makes the whistle much softer.
Right now I prefer solo playing with my C# body 
Cheers,
~Hans