Wow that's great! We occassionally hear of Kombucha turning gray hair
back to its original color, so we'll see this may be another one of
those miracles!
If you really want a new scoby, you can "grow" them - put Kombucha in
a mason jar (without a scoby) and leave it covered for a couple of
weeks. But otherwise it's fine to use the same SCOBY basically
forever. Some people swear by keeping the SCOBY handed down to them
by their great great grandmother and discarding the new ones.
We now buy our sugar from a distributor - Glory Bee from Eugene - but
you can get a big 25 or 50 lb. bag at New Seasons. Just call ahead
and they can usually have it ready right away or at least within a few
days. Thanks for the questions!