I had a Samba Sport about 17 years ago, Its reg was STN 788Y (My First car) it was great, But I have never seen another one, I sometimes have a look to see if one turns up for sale. But apart from the one the OP has, they do seem to be very very rare now.
Just found this thread, I was responsible for killing off a black Samba S in 1991 after rolling it and ending up on its roof. I have got some pics of it somewhere (way before the days of camera phones).