Kibble and raw is not suggested, it can really be hard on their tummies. It can be done, if you take away kibble 2 hours before raw and give it back 2 hours after.
I'm on my iPod again so not going to write a novel, but I've done raw and can definitely help switching a ferret to that route, if you choose
![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
. It really is cheaper than kibble, cause other than the first few weeks, they only eat like 3oz a day LOL