I bought a tiger muskie at the Ocean design aquarium in the dunning square shopping mall, in Chicago, but that was over five years ago. If you're in the city, you might want to give them a call. Also bought a small mouth from there at the same time- the small mouth survived, and flourished in my tank, while the tiger muskie croaked after a day or two.
On a side note, that small mouth was an amazing pet, and showed it's intelligence frequently. It used to suspend in the tank and watch me, turning and facing me the entire time, and I used to feed it crickets by hand. I kept it for over a year, and released it into lake Michigan when it outgrew the tank.