Need an arrangement written

I'm looking for somebody to arrange a solo of Moon River (Frank Sinatra) for trombone. I don't need a recording of it, I just need sheet music written. I chose this song to be played at my grandmother's funeral and would like to play it for solo competitions since she always enjoyed hearing me play. Even if you can't do this yourself a reference to someone who could would be nice.

Additional info:
The song has less than 10 tracks recorded that need mixing. The vocals will only be used for demo purposes. Not for release.. I'd rather pay extra for the writing to be ‘work for hire' and not share publishing..