A large number of compounding pharmacies ship.  Here is the addy for the
list of recommended compounding pharmacies that are used to helping
ferrets.
 
http://www.smartgroups.com/vault/ferrethealth/ReferenceShelf/comp_pharm.html
 
If the addy doesn't work directly for you go to
http://www.smartgroups.com/groups/ferrethealth
then click on "Files".  In Files open the "Reference Shelf".  Then just
select that file.
[Posted in FML issue 4233]