That price really depends on kind of cabinet it is.
If it is William's title with sideart, a nice condition Nintendo cabinet, a "Deluxe" type cabinet, or a POPULAR Atari cabinet with sideart, then that isn't TOO bad.
But if it is a painted over cab, or a woodgrain one, then it better look fresh out of the crate for $140.
If you are near ST. Louis then I will sell you one for less. I have a couple available, inluding a Williams Defender with sideart (currently on ebay for $1).