That fee basically re-imburses us for our out of pocket vet and other expenses. Most of the time, this doesn't even come close, but it does help keep the shelter afloat. This is the minimum that all ferrets should have annually. Older ferrets should have bloodwork done annually, as well. Consider yourself lucky if you only need the annual preventative care.
Food is an expense, too.
The mix varies depending on which foods are on sale at the time of purchase, but the staples are always the Totally Ferret, and 8 in 1 Ultimate. The ferrets also get a supplement called Nupro which they all love, and its all natural. It also comes from The Ferret Store or directly from the company. So, you see, food can be a bit expensive. Ferrets should be fed a high protein, high fat diet, which can be expensive.