Hi-- As a former ferrets rescue person, we have 22 ferrets and 4 more in foster care. The biggest expense is vetrinarian bills as the ferrets age. If you want more ferrets, space them out 2 or 3 yrs apart. they won't all get sick and ill at the same time (it can happen) and it will keep your vet bills down. As you add new ferrets to a bonded group, you reduce the risk of an older ferret grievig for its lost companion and possibly dying itself. Kathy Gallagher Celtic Ferrets Columbus, OH [Posted in FML issue 3675]