The original Black unicorns (male, mother, baby, and young) were retired in 2000. That is the color now called “Old Black” to distinguish it from the new “Jet Black” unicorns.
Since they are retired, the original Old Blacks won’t be made again. However, it is possible to find them on ebay or from a collectors’ group (unless you are hoping to find an Old Black Grand unicorn). A few Old Black Grand unicorns were sold on ebay as a one-time thing. They won’t be made again and are virtually impossible to find.