Do they have violin sheet music?

I'm believe yes

They carry a few odds and ends for violins, like strings and I saw the Suzuki book 1 there a while back. However, I wouldnt recommend them for violin needs in general.

Call them! I'm not sure

No

I have never seen any there, but the place next door might.

Nope

No, but I think the piano gallery (i think thats the name of the store) next door does.

I do not believe that they do.