Pianophilia

Does anyone know where I can lay my hands on (buy, borrow or download) a copy of the vocal version of the Gopak/Hopak from the end of Mussorgski's Sorochintsy fair? I heard it on the radio the other day and would love to add it to the repertoire of the opera chorus I conduct. I downloaded the version from imslp.org but this is the Cui version which doesn't have this ending. I don't recall what the announcer said but I assume that in Mussorgski's original that I was hearing.
I checked a few publishers and places like sheetmusicplus.com but it doesn't seem to be available. I'm gonna check some libraries but if anyone knows anything about the opera or which version to look for I'd be grateful.
thanks,
Rob

A huge thank-you from one Rob to another. I'm always on the look-out for out-of-the-way items to put alongside the popular crowd-pleasers (we do after all want people to come to the concerts) and I'm sure this one would be a winner. Now just to find a friend who'll help me teach the Russian!.
Thanks again,

Rob