You might try Dick's Sporting Goods, Tennessee Sports Fan (they're around malls), Academy, or Hibbetts. Call and ask. I don't know how good their selection is--really the pro shop has about the best selection I've seen in one place. A lot of times you'll see a lot of one player in a place but no other ones.
To the person asking about the sound for concerts. I'll be honest, I don't think the concert sound is great and I'm no audiophile. But if you're going for the experience, you should be able to see from most of the upper bowl, but remember it'll be upper bowl and you probably can't see the expressions, you know? The only thing I'd be really wary of is being behind the stage. Usually the stage is set up around 110 111, in front of the zamboni entrance if that helps. You'll want to stay away from 313 to 322 or so or be really sure the sight lines are there.