Supplies and Repair
Gringo Star Guitar - located in St. Paul, MN - Seller of quality fractional classical guitars
Rosewood Music - My recommendation for local (Duluth) repair work.
Strings By Mail - Based in MI, huge selection of strings, books, instruments and other materials. This is where I order most of my supplies from.
Sweetwater Sound - Of the "big internet music vendors", this is my preferred choice. Very good customer service.