"Welcome to the world of snake-keeping"-Personally I'd just euthanize* the mouse, because I'd be afraid that someone wanting "free snake food" will not understand (or believe) why this one shouldn't be fed, & lie about their intentions. *If you don't feel comfortable doing that, I have a feeling that if you ask a local vet to euthanize it & explain the reason to them, they won't charge you a whole lot- anyway, it costs nothing to call around & ask. A vet's office may actually have someone on staff or know someone that wants the mouse as a pet too, so there's that angle. Some vets have bulletin boards of pets needing new homes- also free to post.