Hey Hack, check out this link:
http://www.petfinder.com/shelters/PA279.html Hope that helps, they say that they really need foster homes. There is/used to be a shelter called Semper Fi Ferrets litterally right around the corner from my house, but her site has been down now for a while so I don't know what's up. Last year I had emailed her and she said she was doing renovation and didn't have any rescues at the moment... but like I said that was a year ago. I had been hoping to help out myself somehow, if only just visiting to handle and socialize the ferrets. Well, good luck! Also, I'm sorry to hear about your loss.

Julie
PS - here is the main site for the ferret club:
http://www.ferretclub.com/PPS - Oh! oh! I found another!
http://www.newrainbowbridge.com/