1) Wayne Tile has a store in Rockaway. The company has a great reputation.
2) Standard Tile has a store in East Hanover, but depending on where you are in Morris County, either their Totowa or Watchung store may be closer.
3) Try an Internet search. New Jersey has an abundance of tile suppliers.
4) Don't dismiss Home Depot too quickly. I recently needed to buy tile and was shocked by HD's extensive selection.