While you can find many books, recordings and supplies locally at music stores, I also find it helpful to browse online shops. These listed here have full inventories of almost everything you'll need to help your student learn and grow through years of music study. They are generally very prompt with shipping, nearly always have items in stock and are a valuable resource on the phone when you're not sure about a product.

 

SHAR - www.sharmusic.com

Johnson String Instrument - www.johnsonstring.com

Southwest Strings - www.swstrings.com