Where can I get good Graphite

Where can I get good Graphite? For many people this is a strange object, and here's the introduction to it:

Graphite is one of the elements carbon allotropes, each carbon atom surrounding link with the other three carbon atoms (arrangement in multiple hexagonal honeycomb) by covalent bond, covalent molecules. Carbon is a very common element, which is widely found in the atmosphere and the crust in many forms. Carbon has long been known and exploited, and carbon's array of compounds -- organic compounds -- are fundamental to life. Carbon is one of the components of pig iron, wrought iron and steel. Carbon can chemically combine to form a large number of compounds that are biologically and commercially important molecules. Most molecules in a living organism contain carbon.