There's a guy in Australia who will do it for $750. Use Google and see what others have done. A friend just passed one on to me and I don't have the ambityion to do anything with it, so it's available, for shipping costs.
What exactly did your friend give you? And how much would you be asking for it? Only shipping!? I'd love to get my hands on a Polaroid 4x5 conversion for some of my current projects. Let me know!