I want a mousse and a mouse.
An alternative to a breeder is to adopt from a shelter. Our local RSPCA always seems to have mice. So far, my adopted rats (4 of 6, the other two came from a breeder) have not been any less healthy than my breeder rats, and there's the added advantage of knowing that you've made a difference to an animal that didn't really have a future. :)
After my current beautiful ratties pass on, I would love to have a mouse (I can't get more rats because I'm going on a world trip at the end of 2014), but I'm not allowed.