There was a production done in London back in the '80's, but they interpolated a lot of other songs by some other writers into the score.
It might not be available from RHR Theatricals, but the Richard Rodgers' estate would be the people to go to about it.
And, unless it was stored in that legendary warehouse in New Jersey, you might not get all that much about it even from Rodgers' estate.
"A coherent existance after so many years of muddle" - Desiree' Armfelt, A Little Night Music
"Life keeps happening everyday, Say Yes" - 70, Girls, 70
"Life is what you do while you're waiting to die" - Zorba