The most expensive flagpoles cost hundreds of thousands of dollars, as in the case of some of the more monumental poles. At the high end of the usual spectrum, however, an eighty-foot aluminum commercial pole might cost $10,000. Shorter and residential poles are more financially feasible.
Flagpoles are usually sold as kits, with all the hardware included. For example, a fifteen-foot aluminum residential pole with an external halyard system costing $500 would probably include a flag; a ball or “finial” for the tip of the flagpole; a pulley system or “truck assembly”; cleats (the handles around which the rope is wrapped to lock the flag in place); rope or “halyard” with snap hooks to keep it from clanging noisily against the pole; a flash collar for giving the base a finished look; a groundsleeve; and easy-to-follow assembly instructions.
Internal halyard systems are more expensive, because of the extra assembly time it takes to produce one.
Fiberglass flagpoles are a bit more expensive than aluminum, because they show less wear and tear than aluminum. And bronze is even more expensive, because it is in lower demand. Finally, steel tends to be the most expensive, because it is practically invincible.
There are plenty of flagpole dealers to choose from. You can find one by looking up flagpoles in your local yellow pages, or by doing an online search.