Flagpoles worth hundreds of million of dollars are some of the most valuable. This is especially true of larger, more elaborate flagpoles. An aluminum commercial pole eighty feet in length might be worth $10,000. This is the most expensive end of this range, more info here. Economically speaking, a shorter residential pole is better.
Most flagpoles can be purchased in kits which include all the hardware. A $150-per foot residential aluminum pole with an exterior-halyard system would include a flag, and a ball. You will also receive a pulley or “truck assembly” and cleats. These are the handles that hold the flag in its place. Snap hooks keep the rope from breaking against the pole. A flash collar gives it a finished look. Instructions for assembling the flagpole.
Internal halyards can be more expensive as they are more difficult to manufacture.
Fiberglass flagpoles tend to be more expensive than aluminum because they wear less than aluminum. Bronze is more sought-after and therefore is more expensive. Steel is nearly invincible so its prices tend to be highest.
You have many options for flagpole dealers. You can either search online for flagpole sellers or check your local yellowpage.