I don't think anyone could give you a straight answer unless you listed the components needing replacement for the "brake job". There are brake pads, rotors and calipers + the labor attached to each of these sub-jobs within "brake job".
Also there's the factor of the brand and quality of the parts used, which can vary widely.
So if you do comparative shopping, be sure to ask a) what exactly are you replacing and b) what is the brand name of the parts you are using? Ford? NAPA Auto Parts? Republic of China?