Taking time to research your security project
Keep in mind that even within different levels of systems you will have higher priced items and lower priced items. We have several price levels of alarm systems and cameras depending on their warranty, features and brand such as a vandal resistant dome costs more than one that is not vandal resistant. A camera with a verifocal lens costs more than one that does not have that type of adjustable lens. A camera that sees in the dark costs more than one that needs ambient light. A camera with a heater and blower costs more than one that does not have those features. A cameras with an SD card option has a higher cost than one that does not have that. A 4TB NVR costs more than a 500 GB drive and so fourth.
A Bosch cameras costs more than a no name camera from Asia. Even within the FLIR line we have several levels of pricing according to the features