I agree with the above, just go to SoundSmith and purchase an SMMC4 from there. They're extremely well made, matching or exceeding Bang & Olufsen's own specifications and they're NEW. Original B&O MMC cartridges can be found on ebay & the like, BUT:
-they're never cheap
-you could get shafted on the quality
-they're old stock, almost always used, and always old
Save yourself the hassle of trying to track down originals and just go for the SoundSmith's! :)
mike s