Hi hun, ferretone is availble readily here.  But all it really is , is a
vitamin supplement in liquid form, ferrets just love the taste.  There is
also a paste they like, in a tube like toothpaste called ferretvite.
 
I've done a search and found a site that sells Vitatone, the same sort of
thing.  It says they will ship all over the world, although i haven't
checked the delivery charges.
 
Here's the link directly to the 'Tone' page xx Carol
http://www.ferretstore.com/food---nutrition-supplements.html
[Posted in FML issue 4448]