Which type of firearm sight is inexpensive?

Iron sights are the most inexpensive type of firearm sight. They consist of a front post and a rear notch or aperture, allowing for quick target acquisition without the need for batteries or complex adjustments. Due to their simplicity and durability, they are commonly found on a wide range of firearms, from handguns to rifles. While they lack the precision of more advanced optics, they are effective for many shooting scenariOS.